Neuroscientist Warns: These Daily Habits Are Raising Your Dementia Risk

Key Takeaway

How we use our brains is the primary determinant of how they will function. Up to 45% of dementias may be preventable through lifestyle choices. The key is the 3S Model: Stimulus (challenging your brain through deep learning and social interaction), Supply (cardiovascular health, metabolic health, and essential nutrients), and Support (quality sleep, stress management, avoiding toxins). Start with one change—like improving sleep or learning a new skill—and the entire network shifts in your favor.

Episode Overview

Dr. Tommy Wood, a UK-trained physician specializing in brain health, explains that up to 45% of dementias are potentially preventable through modifiable lifestyle factors. He introduces the 3S Model (Stimulus, Supply, Support) as a framework for maintaining cognitive function across the lifespan. The episode covers how cardiovascular health, metabolic health, cognitive stimulation, social interaction, nutrition, and sleep all interact to determine brain function. Wood challenges the outdated belief that cognitive decline is inevitable, presenting evidence that the adult brain remains plastic and capable of adaptation well into later life.

Full Transcript

Transcript of Neuroscientist Warns: These Daily Habits Are Raising Your Dementia Risk from Rich Roll Podcast. Auto-generated from episode audio; may contain minor errors.

The best way to minimize your risk of dementia is not sit at home uh by yourself jugging supplements. It's going to be much more about Dr. Tommy Wood is a UK trained physician. His research focuses on brain health across the lifespan. How things like exercise affect dementia. dementia. dementia. If some proportion of dementia are preventable, then we must be able to change the trajectory of cognitive function and cognitive decline. What is driving this? And what else should I be focused on or thinking about? How we use our brains is the primary determinant of how they will function.

Low HDL cholesterol, high triglycerides, high blood sugar or high blood pressure. These are all significant risk factors for dementia and they are effects of Is it true that the adult brain is destined for an inevitable decline? Yes or no? or no? or no? No. How did you arrive at this conclusion? Uh and how do we how do you support that conclusion? Some proportion of dementias are probably preventable. If we think about adult cognitive decline with, you know, a terminal decline to the point where you're no longer able to look after yourself on a day-to-day basis, which we would call dementia.

If some proportion of dementias are preventable, then we must be able to change the trajectory of cognitive function and cognitive decline in adults. in adults. in adults. Is this uh a controversial uh position to take in neuroscience or in neurology? Not anymore. uh potentially 10 years ago it would have been. But if you look at probably the the best uh supported um evidence out there formalized as part of the Lancet Commission on Dementia Prevention uh spearheaded by Professor Jill Livingston. It's now uh in its second iteration.

And it was updated in 2024 where global experts in neurology and neuroscience and the science of dementia and the factors that contribute to dementia risk. Come together and estimate estimate estimate which risk factors um are strongly sort of we think we can causally link them to dementia risk longterm that are potentially modifiable. and they estimate that when you sum up all those different risk factors, um it's a it's sort of a statistical approach that says, imagine that this risk factor didn't exist at all. What proportion of dementias would we expect to to never happen?

Um and when you add all those up, the number they currently have is 45% of dementias are potentially preventable. Um and this is published in the Lancet, you know, the one of the premier medical journals uh in the world. So at least 45% are thought to be preventable. And there are risk factors that are strongly linked to dementia risk are also modifiable that they weren't yet able to add into their models that you know some people think it could even be more than that. Potentially the majority of dementias may be preventable.

In certain respects from a non-scientific point of view like a very basic you know perspective on this whole thing issues of cognitive decline are on some level a function of a circulatory problem much like heart disease right these amaloid plaques etc that get deposited in your brain are are you know caused at least in part by lifestyle choices that produce them right so why did it take until 10 years ago to you know come to this conclusion that's Great question. Potentially the treatment of heart disease and we've gotten much better at treating heart disease in the last 50 60 years that has then changed the the age specific incidence of dementia in the population.

And what I mean by that is that at any given age you are now less likely to be diagnosed with dementia than you were 20 or 30 years ago. So at 70 years old or 80 years old you're less likely to be diagnosed with dementia now than you would have been done uh previously. And part of that is thought to to be because we've gotten so good at treating cardiovascular disease, which is a risk factor both for vascular dementia, which makes up something like 10 to 20% of dementia, and Alzheimer's disease, um, which has a a vascular, you know, disease component.

Um, so, and that's, you know, Alzheimer's disease is maybe 60 to 80% of dementia. So, at least 70 to 90% of dementia do have cardiovascular risk factors as a risk. And that's something that we've actually gotten better at treating. Um, but even if you go back to the the 50s and 60s, the Seattle longitudinal study, it was one of the first studies where rather than taking a whole population and looking at their cognitive function and seeing, well, you know, the average 70-year-old has lower cognitive function than the average 50-year-old, and we're talking broad cognitive function, if you test multiple different um multiple different functions, you sort of add them up.

This was one of the first studies where rather than just taking a big population and looking at cognitive function across that group, they looked at the same people over a long period of time. And so he brought people back every seven years and rememeasured their cognitive function. Um, and what he found first one one of the papers they published was that cardiovascular risk factors were strong predictors of change over time. So we knew that back in the you know 60s and 70s when he first published those data.

And then the other thing they found was that the average effect so more than 50% of people maintained cognitive function from their 50s into their 60s7s and 80s. Nowadays we call people who do that super aes right because we think it's so unusual but actually we knew even back then that the the majority of people sort of 50 60% maintained cognitive function into those later decades and those data were actually used to raise the retirement age in the US in the 1980s. M um so we've had some inklings of this uh for a long time.

It's just that getting a big enough set of data, finding a systematized way to you know really sort of put it together in and then frame it as prevention rather than these are just risk factors, right? that and knowing that we if we treat heart disease for example and as a result age specific instance of of dementia comes down which is what is sort of like part of the hypothesis of that then for the first time we can say oh yeah if we do something at the population level we can see changes in dementia risk therefore we can now start to talk about prevention the statistics uh bear out a a rapid rise in Alzheimer's and dementia I looked into this from What I gather uh the it's due to double in the US by60 going from 7 to 14 million.

There are currently somewhere between 6.7 and 7.1 million people in the United States with Alzheimer's. This is predicted to be 139 million worldwide by 2050. There are 10 million new cases annually. My perception is that you know maybe it's just my age or because of what's happening with my mother that you know this is rampant and happening everywhere. So what is uh driving this and what should we understand like what you know what's what's vital to extract from those statistics about this condition. condition. condition. The statistics that you give and the ones that I gave are both true at the same time.

meaning there's a high degree of agency in terms of prevention and yet we're also seeing this you know rapid rise well at the same time same time same time and the age specific incidence has declined over the last hundred years right so you're less likely to be diagnosed with dementia at 75 years old now than you ever have been but you're also more likely to have to ever be diagnosed with dementia because we're going to live much longer living longer yeah both of those things are true at the same time people are projecting that the burden of denure may double or triple in the next few decades.

Um, and that's largely due to an aging population. But some people such as those who have analyzed the data and shown that age specific instance has decreased have suggested that maybe that that sort of projection is a bit of an overestimate and the the increase in burden may not be that large. However, things that seem to be contributing to it in particular are the ongoing worsening metabolic and cardiovascular health of of the population. So, we're still seeing even though many things have improved um smoking, heart disease treatment, access to education, access to complex cognitively stimulating jobs, particularly for women, which has which has sort of massively improved over the last 100 or 50 years or so.

that is contributing to some of that decline in age specific incidents. At the same time, we're seeing worsening in obesity rates and type two diabetes rates and we know that those are significant, you know, high blood pressure is one of the most important predictors of of dementia risk. So, if we don't manage to change that trajectory, that's one of that's one of those are one of the things that are expected to to continue to drive up the burden of dementia. However, we say that in the age of the GLP-1 receptor agonist and the the other the other therapies in that in that class which have huge effects on cardiovascular disease risk, blood pressure, uh blood sugar.

So, it's possible that actually we're we're also changing that trajectory due to the nature of those medications which if started early enough you would expect to decrease dementia risk because of the effect they have on metabolic health. given the high degree of agency that we have to stave this off. Um let's get into uh how we can be brain protective and brain healthpromoting. healthpromoting. healthpromoting. And what I like about your approach and your work is that it's grounded in in in the basics. You know, I think when we, you know, cast our gaze on the internet, there's a lot of fancy dooddads and, you know, latest breakthroughs and supplements, etc., uh you know, which is which is a lot of cherry on top of the Sunday kind of stuff.

We're very dialed in on the connection between things like nutrition, exercise, lifestyle choices, recovery, etc. when it comes to our physical health. Um, and we've gotten a lot better about how we consider our mental and emotional health, health, health, but we really don't think about this thing between our ears and the fact that these decisions that we're making every single day actually impact like how well this is functioning. So what is your kind of topline uh thesis on how to enter this aspect of the conversation?

conversation? conversation? One place to kind of transition from what we were talking about to to this place is to think about some of the the risk factors that we know are in that list of modifiable risk factors for dementia that were included in the Lancet um commission report. So it's things like um education um and we know that cognitive stimulus is is really important. It's um maintaining uh sensory input. So hearing loss and and vision loss are significant risk factors for dementia. It's all the cardiovascular stuff that we talked about.

High blood pressure, diabetes, um smoking, alcohol, air pollution, obesity, head trauma is another one. And when we think about that, we can very rapidly create this massive list of things that that we need to think about. Um, other things that that weren't included in that in that report, but which I think we have strong ev strong enough evidence for to to talk about in terms of prevention include um, nutritional status and the the um, certain nutrients we know are critical for the brain. Sleep we know is a is a critical component.

Um, and so the way that I think about it, and it's probably largely because I spent a lot of my time working with athletes and, you know, being an athlete myself, I actually I draw a lot of parallels between physical performance and cognitive performance and and long-term cognitive function because essentially the principles seem to be very similar. And many of the things that you would do to improve physical health um or mental well-being or physical performance, they actually translate very nicely over to It's shocking how those they line up like that.

Yeah. Yeah. Um and I think that's lucky, right? Because then we don't need to we don't need to focus on different things. We can just appreciate that that they're also maybe doing some benefit for our bra bra bra or making some kind of pirick choice between physical health and brain health. health. health. Exactly. The way I think about it is very similar to um a stimulus recovery adaptation model that you might see in physical exercise. So um if you're trying to improve physical performance, we know that the primary driver of improved cardiovascular fitness or improved muscle size or strength is the stimulus that you apply to it.

Right? So, the training that you do for your marathon or the lifting you do in the the in the gym if you're trying to build uh muscle strength, you can improve how you adapt to those stimuli by attending to your nutrition and attending to your recovery. But the stimulus is the most important thing, right? I like to lift weights and unfortunately like no matter how many naps and protein shakes I have, I can't I won't get bigger biceps unless I, you know, do some bicep curls.

Mhm. And the brain I think is essentially the same. So the thesis in the book is that how we use our brains is the primary determinant of how they will function. Um and that means that we need stimulus. Um and I know that this is slightly controversial in the current world where we're I I believe that we're we're chronically overstimulated while being under stimulated at the same time. We're sort of constantly bombarded with multitasking and multimedia and social media and these things that don't truly drive improvements in brain function and feeling overwhelmed because of it whilst not being able to attend to the real focused deep um learning and skill development which is what really drives brain function.

And so the stimuli that we can think about that sort of drive this whole system uh include um education and learning any kind of skill development be that music, languages, complex motor skills and then also social like social interactions which we know is a a primary driver of both human brain evolution and then human brain development and maintenance. So we need to think about like how we're using our brains. But then once you've stimulated a region of the brain by engaging it in some task, you need a supply of the things that allow that to happen.

So now we're kind of getting into what I call the 3S model. The first S is stimulus. The second S is supply. And so right, if you activate a part of the brain, the local cells, the neurons, the astrotes, they stimulate the blood vessels to dilate, to widen, to bring in more blood flow. Uh so that's where we need good cardiovascular health, right? You you need that to be able to respond to uh changes in activity in the brain. Um and then you also need a supply of energy.

So that's where we need good uh energy regulation. Um good metabolic health because glucco glucose is going to be our primary uh source of energy. But ketones, lactate, right? Those those those can play a role too. Um and then we need a supply of nutrients to kind of run that system. So things that become critical particularly in terms of dementia risk are B vitamins associated with methylation, omega-3 fatty acids, vitamin D, iron um and then some others like magnesium, zinc, uh antioxidant vitamins like vitamin C, vitamin E, and then the antioxidant polyphenols um that you can get from colorful foods do a bunch of cool stuff for the brain.

There may be some other precursors like choline or ethanolamine that you can get from eggs or whole grains. like those kind of provide a structural component and we can get into all of these different uh sections. But so we've stimulated the brain, we've brought in a supply of things that we need to kind of allow it to do its job. And then just like with um our physical performance, you don't get stronger when you're training, you get stronger when you rest and recover afterwards. So this is my third S, which is support.

So sleep is a critical part of that. That's when all the signapses that you've generated uh during the day by through your skill learning are uh cemented and refined to kind of you know build part of or like build new aspects of uh structure and function in the brain. And we can see that with skill learning we can see the brain change on MRI scans as these sort of um processes are driven even in older adults in their 60s and 70s. Then we can support those processes with um what we call trophic factors.

So things that like support the growth of sinapses um and function of neurons in the brain. So uh one that's produced during exercise is brain derived neurotrophic factor. Um hormones play a role here too. I mean you had an excellent episode with Lisa Moscone. That's really her area of expertise, but hormones sort of support brain function as well. Um and then we want to avoid things that kind of inhibit that adaptation process. So this is where things like alcohol, smoking, chronic stress, air pollution come into play.

Um, and so all of these things interact. And the reason why I talk about it in this way is because it's not this massive list of 20 things you need to attend to. Um, because uh, stimulus drives the the processes of of adaptation and stimulus drives the processes of supply and supply drives support. They interact. And what you see quite clearly is that when you change one thing, you change lots of lots of things at the same time. So you can so if you start by stopping smoking right you've you've removed one risk factor but you will also see improvements in inflammation and improvements in blood pressure and you're more likely to um make other healthy diet like diet choices for example we know that that that happens or if you start to sleep better again blood pressure improves and the next day you feel more social and you're more likely to engage in cognitively stimulating tasks so I think about it this way so that there's an in for everybody and that in could just be one thing and then the whole sort of network starts to shift in your favor.

Mhm. There's so much in there. Don't worry, we're going to tease out all of these things individually. Uh but I really like this paradigm, this 3S model of brain health, stimulus, supply, and support. And within that, you canvased exercise, nutrition, exercise, nutrition, exercise, nutrition, um you know, challenging your brain, you know, stimulating it in various ways, supplementation, etc. within the hierarchy of those respective pillars, what is to your mind like the most important or is that too reductive? Like like you're you're you have a whole kind of thing in your book about like the problems with you know the reductive nature of of science and yet you know you get asked these questions that are that are compelling you to kind of reduce these things down.

Yeah. So, so this is actually another part of the question that you asked earlier, which is, you know, why haven't we started to think about dementia prevention in this way until very recently and I think part of it is because we we've been chasing down one reductionist pathway, which is the amaloid cascade. Um, and then that's kind of I think it's distracted us a bit. Not that that's not important, right? that should remain a part of the our whole picture, but it's kind of it it drew resources and attention away from these other things that that that we can talk about.

The we can talk that we can talk about. The answer is that it's going to differ from person to person, of course. Um, and I think that these things shift across the life course. So, um, in younger individuals, maybe in their 30s and 40s, I think in general, um, they're pro, you know, they're probably receiving a good amount of of stim of of stimulation, you know, unless they're just like at home scrolling on Instagram all day, which is going to be some portion of the population.

population. population. But if you think about um knowledge workers in their 30s and 40s, they're probably going to be doing some kind of complex cognitive stimulating work. But what they need is more on the sort of like the support and recovery side. Are they ever giving their brains a break? Are they spending all their days task switching and multitasking which we know are inherently stressful? Are they giving themselves the times to kind of sleep to be able to recover and and adapt which we know that the is is critical for for the brain.

Um then as you know sort of people get older we might start to see declines in uh physical activity or metabolic health. So maybe that becomes a really critical component in in midlife and then later in life particularly as people retire I think that's when that's when they're at the biggest risk of a decline in cognitive function and we see that from from the you know the research as well and so then I think that's where stimulus really comes to the four is making sure that you're maintaining these either complex skills or learnings or social interaction that you got from work previously or that you got from education previously but then become harder to come by once once you've retired.

Um, and I think that's one of the reasons why um, cognitive decline tends to accelerate a retirement is because we lose those those stimuli. So, I think that as we go through a sort of a a standard life course, the things that are most important are probably going to shift in in that kind of manner. manner. manner. Yeah, the stimulus aspect of this is very interesting. uh the idea that we're overstimulated uh in all the wrong ways and under stimulated in the right ways like just scrolling on Instagram or offloading the synthesis of information or the processing of information to AI.

Like all of these things are are basically harmful to our yeah, yeah, yeah, you know, long-term brain health. We think they're, you know, that we're engaged, you know, in these tasks, but we're just basically, you know, kind of shortcircuiting our ability to problem solve and to do the deeper kind of thinking. And in our distracted, you know, we're just be so increasingly distracted now that, you know, there's great opportunity for somebody who can carve out, you know, the nobody, you know, you can make your way in the world better than ever right now because like the competition is like all distracted, right?

Um yet, you know, when you think of that from a population level, what is that doing to, you know, millions if not billions of people? like, you know, fast forward 30, 40 years from now and what are our brains going to look like because um we haven't really had to do the kind of problem solving that historically we always have. Yeah. Like an important place to start is that these technologies aren't inherently bad. It all comes down to how we engage with them, right? So if so there's even some evidence suggests that something like 5 minutes of scrolling on Instagram as long as it's not making you mad because of you know of some uh emotional political information or um as long as it's not only exposing you to people who are richer, better looking, more successful than you are which sort of like make makes you inherently feel worse about yourself that has sort of like triggered triggers effects in our physiology that can negatively affect our health.

If it's just like you spend five minutes looking at dogs doing funny things, which is a lot of my Instagram feed, right? That can actually be a real mental break that would allow you to go back and and do hard work. But the problem is that's not what that's not how we're using it. Um we're constantly we're using it for extended periods of time plus using it while we do something else, right? So you're scrolling on Instagram while you've got Netflix on or while you're doing emails or while you're in a in a Zoom meeting.

And what you see, there's some really interesting studies where they look at how much people multitask across different multimedia in that way. And what you see is that just as you'd expect, um, if if the stimulus is the primary driver of how our brains function, our brains do actually adapt to that. So people who do that kind of thing are better at multitasking. And the way you would test that in in a study is you have one cognitive task and then you have them do have to do another like another cognitive task at the same time.

And everybody who multitasks does worse on both tasks, right? Because the human brain actually isn't it cannot multitask properly. It can't give full focused attention to two different things at the same time. same time. same time. But people who do a lot of like Instagram plus Netflix plus Zoom meetings etc. um they are better. They they have less of a multitasking cost when they multitask. The problem is that other studies show they're also more distractable because their brains have learned to stop filtering out information from the periphery because they're trying to attend to multiple things at the same time.

So, and then the result is that we're we're distracted, right? And it it impairs the ability to actually do the deep work. Exactly. Because you're not acclimated to it. Yeah. But this is again it's just the brain responding uh to the stimulus, right? you're training it to do this and it gets better at this, but there's a trade-off, right? Just if you want to be an elite level marathon runner, you're not going to be a super heavyweight powerlifter at the same time, right? And this is the brain, like you're training it to multitask.

So therefore, it's less good at deep focused um like attention driving work. driving work. driving work. So then it comes down to how are we using these tools? How are we using technology? And right the other example that would would is going to come up just like you kind of mentioned is is AI right right right anything we say about AI is probably going to be completely obsolete in in in two in two months time um but I think again we can there's like a framework that we can use um and this that we can use um and this was some of this stuff is proposed more than a decade ago by um a colleague of mine called Ken Ford who's an expert in AI and like back when AI wasn't even a thing he talks about this idea of cognitive prosthetics cognitive prosthetics cognitive prosthetics versus cognitive orthotics.

An orthotic is something that you use to enhance or support your current levels of ability. Right? So when I think about orthotics, I think about um shoes for individuals with cerebal palsy, right? If because of, you know, issues with motor control, they're unable to walk, but you give them the right orthotic, they can walk. You've enhanced their capacity. Um whereas you use a pro a prosthetic to replace something that you don't have. You have a prosthetic leg because you're missing part or whole of your leg.

We are at risk of using AI as a prosthetic instead of our brain as if we didn't have one. And we know that when we don't continue to engage those skills or things that you know we're using AI to do for us, we will lose those functions or we'll never develop them in the first place. Um but we could use these tools as a as an orthotic. We could say um we do the work ourselves, right? And there are some initial studies on this with uh students writing essays.

This is one study that sort of like blew up the internet uh was an essay writing study at MIT. at MIT. at MIT. So the the students who ended up doing the best with the with were were the students who wrote the essay first themselves and then afterwards they got access to an AI tool. Um, and then it's then you're saying, you know, how can I improve this? What can I do better? What what have I never thought about? What have I missed? And then you take that information and you integrate it back in yourself, right?

So, all of that requires you to do the work. It requires you to be engaged. But you could use these tools sort of like help you learn and expand your capabilities. Um, but it's all going to come down to to how we choose to engage with them. Yeah. Are you using them uh for the purposes of offloading or synthesizing? Like if you're if you're using as a tool and then you're doing uh the synthesis yourself, the heart the heavy lifting of like how do these pieces fit together?

Um that would be brain health promoting because it's a stimulus. Exactly. It seems like in the context of of dementia and Alzheimer's stimulus speaking of reductionism has sort of been reduced to this oh well you do cross you know cross word puzzles and you know like this is like no this is not you know the idea kind of writ large is you know how engaged with life are you like are you you know actively spending time you know with with friends are you engaging with other people are you trying to learn a new skill like on this idea of our brain s uh uh maintaining a degree of neuroplasticity throughout the entirety of our lives is somewhat novel like you know I grew up in a time where it's like oh yeah well if you're going to learn a language or a musical instrument you got to do it when you're young and then it becomes hard and so we all have that experience of not being as neuroplastic as we once were.

Uh and I think we just sort of assume well we're just you know we just you know it just becomes harder and harder to learn new things but essentially what you're saying is uh not only can we do that it's urgent that we are always kind of engaged in that process. process. process. Absolutely. I I think that sort of whole idea has been embedded in society for more than 100 years if not well before that. um that as we get older, we essentially become useless, right?

And we're unable to learn new things. We need to be put out to pasture, right? That was that was how retirement was framed when it was first popularized back in the beginning of the 20th century was by the time you're 60, you're essentially you have no use to society, so we just have to like find a corner to stick you in. And we've embodied that as a society. And therefore, this is something that we expect, right? There's this idea of stereotype embodiment theory, which is that if we expect aging to be associated with a significant loss of physical and cognitive function, we will know we we stop engaging with the things that maintain physical and cognitive function.

Oh, I'm too old to learn that. Oh, I'm too I'm too old to lift that. A vicious cycle. Yeah. And it becomes a vicious cycle. Exactly. So what you see is that even in people in their 60s, 70s, 80s, when you do a randomized control trial of language learning or music learning or physical activity, you can see structural changes in the brain. You can you can measure improvements in cognitive function. The brain is still plastic at those ages. It's true that learning is is potentially slightly harder and takes a little longer than when you're very young, but that's not because the adult brain isn't capable of change.

It's because you have shaped your brain to uh allow you to best function in the environment that you've put it in. Right? So, you don't want it to be like really really malleable because it's already become the person that you are, right? And that's what that's what you want. So, it's capable of change. You just have to engage in the processes that drive change. Show your brain that it matters. And the way the way to do that is by truly focusing on something. Um and then that that change will happen.

We can measure changes in both the structure and the function of the brain um in regions that are susceptible to the processes of aging that um become dysfunctional or lose volume in the processes of of uh dementia. So we can see even late in life we can change that trajectory if we engage in these different you know true sort of cognitive stimuli. Yeah. I've been sleeping on my birch for many years now. And what I have realized over time is how much my day actually starts the night before when my sleep is solid.

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Don't tell anyone. The code is rich. you know, we develop these neural pathways and preferences over time and, you know, kind of like uh groove these ruts in our brain and we know what we like, we know what we don't like. And, you know, the older we get, we're more kind of calcified around like doing anything different or new. We're more resistant, right? resistant, right? resistant, right? As an athlete, like I want to do the things that I'm good at, that I know how to do.

like I want to go trail running and I want to go swimming and you know is but what I probably should be doing is taking a jiu-jitsu class or an archery class or you know trying to develop a new skill where you know in something that I'm not good in. Yeah, there's this um interesting thing that you see in adults which we've all experienced, right, compared to kids. And I think this is one of the reasons why kids learn much faster than than adults do is that the primary driver of neuroplasticity neuroplasticity neuroplasticity is errors and making mistakes.

So when you are experiencing the world, you're not truly experiencing the world, right? We're experiencing a prediction that your brain has of the world as it happens around you because everything happens on a slight delay. Mhm. Mhm. Mhm. So because of that, the brain is constantly looking for errors, mismatches between um expectation and reality. And you can measure these mismatches um with like an EEG, electrophilography, you can measure electrical activity in the brain. You can see when the brain notices something that it didn't expect. Um it's it's largely driven by like a a drop in in dopamine and and a few other things.

Um but then that's what drives change because the brain's like, "Oh, hang on a second. I didn't get that right. I need to create new connections. I need to shape something differently in order to improve my prediction in in the future." And we see this from um learning research as well, like what helps uh people learn faster. And one of one of the most important things is making mistakes, is making errors because it drives those processes. That's why you know a lot of neuroplasticity is driven by neurotransmitters like uh noradrenaline um and dopamine you and these are catacolamines.

These are stress hormones right so it feels slightly uncomfortable um and that's part of the point um this is your brain attending to something important and diverting resources to change and response. So what that means for us is that we have to do things that put us in a in a position to make mistakes or to fail occasionally, right? You don't you don't want to fail all the time because it becomes very demotivating. But somewhere where you can see progression, but occasionally you're sort of like pushing at the edges of your current capability because that's what drives neuroplasticity.

But adults hate that, right? anytime you think about doing something like you go to a jiu-jitsu's class and you're like the bottom rung of the ladder and like people are gonna kick your ass and throw you over their shoulders and like you're worried about injury and all these other things or you're worried about looking stupid. Um but it's putting ourselves in those situations where we have the capacity to try fail learn go back again that's what's really driving um those changes in the brain. So we need to kind of lean into that discomfort.

Yeah. This is not the retirement that I was envisioning for myself. You know it the idea that like the work is never done. The principles that drive growth and evolution for mental health, physical health, etc. like apply to the brain and there is no destination or end point to this and if you want to protect your brain you have to get out of your comfort zone and you know do things that you're not good at and fail etc. So if you are somebody who is hamstrung by this notion of failure or being in a vulnerable situation, situation, situation, uh perhaps a mantra is to think of it like differently as you know a brainpromoting a brain healthpromoting kind of exercise that you're supposed to fail.

If you're failing then you're succeeding because this is you know enlivening your circuitry and uh activating your neuroplasticity. Absolutely. And I think this is where um the right social context can make a big difference as well. Right? We know that social connections are incredibly an incredibly important part of this. Um so having other people who are willing to do this with you, uh you know, you join a class where everybody's a beginner and you and you learn together or you like you and a friend go to jiu-jitsu together and you can laugh at each other as you like fall over and try and figure stuff out.

that's going to help people feel a little bit more comfortable doing it. Of course, like some people will just like go and try it and and uh they'll lean into it and do great. But, uh giving yourself a social context to do this and like feel supported and learn together. I think that's going to add another layer that that might make this a little bit more palatable to people who who could already feel uncomfortable thinking about it. which overlaps with the blue zones idea. Like a big thing that drives Healthspan extension is your engagement with your friend group, your community, whatever that looks like and being accountable to them and doing this as a collective.

Yeah, Yeah, Yeah, let's talk about exercise. Uh how important is movement to brain health? Why is it so important? And how should we think about this? It's incredibly important and the the the sort of the most fundamental reason for that I think is that historically as a species we've moved a lot. Um and it's kind of like there's a there's a quote from an eigo san who says that right it's movement is evolutionary baked into our genes. It's like a requirement of our biology. If you want your brain and your body to function well, it needs to move frequently.

If you think about sort of even just our recent ancestors were maybe walking 15 to 20,000 steps a day, they were moving 6 to 8 hours a day. Um, and it's essentially required just to keep maintenance and other cellular processes going in the body. And that includes in the brain. Um and so because we no longer have that, you know, just like we've um sort of engineered the food environment in a way that means we have to invent diets, we've engineered the phys the built environment such such that we now have to invent exercise.

And now I think we're getting to the point where we've engineered the cognitive environment such that we now have to invent new stimuli, right? That's kind of like the next frontier. But we know uh that different types of movement actually have different effects on the brain. So even just breaking up periods of being sedentary um what we might call exercise snacks um can immediately and boo uh boost mood. It uh changes blood flow to the brain can immediately change cognitive function. Um so just starting with regular low-level periods of movement during the day we already we already see an impact and we know that the sort of like number of steps that you have in a day and it could be right if you if you don't walk if you if you don't walk and some people some people can't walk it could be like propelling a wheelchair around or like however you get about the world right as as that increases up to sort of the equivalent of 8 to 12,000 steps a day you see a linear reduction in risk of dementia and a linear increase in cog in cognitive function.

From there, we know that sort of aerobic type movement. So, now if we're getting into brisk walking, jogging, cycling, this seems to be particularly good for memory function um and the structure uh and of the gray matter. So, like if you think about the brain, it's this big wrinkly sort of fatty ball and the the the outer part is the is the cortex is the gray matter and then there's more gray matter inside. Um, part of that is the hippocampus, which we know is really important for memory and is particularly susceptible in the later stages of of Alzheimer's disease.

And so, uh, we know that people who regularly do something like brisk walking, they can significantly improve the structure and function of of the hippocampus. There was a more recent study, uh, that that kind of told us that intensity is also important. So, some of the things that get released during exercise, I mentioned brain derived neurotrophic factor earlier. there are, you know, dozens of of miaakines or exacins that get released, many of which can impact the brain, but they're released in an intensity dependent manner. So, there was another recent study uh in individuals in their 60s and 70s.

They randomized them into three groups. They had like a control group, they had a a sort of like a zone 2, low zone 3-ish sort of jogging kind of group, and then they had a high intensity interval training group. And for 6 months, three times a week, they did 40 to 45 minutes of their chosen exercise. Um the the HIT group did the Norwegian 4x4 protocol. Um so for those who aren't familiar, it's 4 minutes of running at 85 to 95% of maximum heart rate. In this study, they had a 3minut rest in between.

Some studies have four minutes, some studies have 5 minutes. I don't think it matters that much. Um and then they do that four times over. And they did that three times a week for six months. Mhm. And interestingly, what they found was that both the sort of the jogging group and the HIT group improved cardiovascular fitness by the same amount. Um, but the HIT group had much greater improvements in the structure and function of the hippocampus. Um, and so they they did much better on a learning task and that benefit was retained for 5 years.

They went back five years later and they still had u maintained improvement even though they'd gone back to their previous levels of exercise. they hadn't said, "Oh, I love sprint training, so I'm just going to do more of it." Um, they'd gone back to being relatively sedentary. And they still had benefits 5 years later. So, that's kind of on that spectrum of aerobic exercise up to sort of sprint training. Um, you see, um, across the entire spectrum, you see benefits. Um, but that type of exercise seems to particularly benefit the gray matter and and memory function uh largely by improving the uh the hippocampus or supporting the hippocampus.

Then we might think about resistance training. Um, and what we see with resistance training is that it seems to particularly benefit the structure and function of the white matter. So the white matter sits underneath the gray matter. Um, and it's where all the myelin is, like all the sort of fat in the brain. And it's responsible for like the really fast connections. It's really important for, you know, com our complex cognitive functions like decision-m, executive function, that kind of stuff, which we know is lost even early on in the dementia process.

and uh resistance training something like the studies they've done two times a week exercises like on which could be machines in the gym that cover the entire body you know five or six different exercises um three sets of eight to 12 reps a very basic resistance training program um twice a week for 6 months significantly improves the structure and function of the white matter so improved executive function and other things and you can see the changes on an MRI scan then the final piece uh when it comes to exercises is like these complex um movements um that we might call coordinative exercise or um open skill exercise is often what they call it in the literature.

So like a closed skill exercise is something like running or cycling like unimodal unidirectional. Whereas an open skill exercise is something like badminton or um a martial art that requires you to kind of learn complex motor patterns, respond to the environment, respond to other people, maybe strategize um you're trying to manipulate your opponent around a tennis court um and process information much more quickly. um which is um particularly important as we get older as processing speed tends to drop off but it is trainable if we're doing things that require us to rapidly process information and this seems to be the best way to support sort of overall cognitive function depending on which kind of meta analysis of the studies that you look at.

Um, and so that stuff, like I said, ball sports, team sports, board sports, martial arts, dancing, uh, dancing is often like wins out across, you know, compared to almost any other activity in terms of supporting both mental health and cognitive function. Um, so to then kind of like fit all that stuff together, um, we can think about just like just moving regularly throughout the day, doesn't have to be particularly intense, just to kind of break up extended periods of sitting. um if we can make our sort of aerobic type training um something that has a coordinative component right so it's a and especially if it has a social part right so rather than just going jogging maybe you uh play soccer or you play babon or even like table tennis um then I think you can get some additional additional benefits there um plus maybe once or twice a week you do some kind of resistance training once or twi twice a week you do some kind of sprint training meaning where um essentially you're just the the goal really is to generate lactate.

Um lactate goes into the brain, switches on production of brain derived neurotrophic factor. And so it doesn't really matter what you do. It's just something that you know gets the heart rate up. You feel the burn a bit. Um and that could be even part of that could be part of your coordinates sites, right? You could you you get a lot of stopping and starting and sprinting in in some things like you know badminton or tennis, but something like that. So regular movement um you know some aerobic sessions being that kind of complex coordinative movement and then once or twice a week you do some kind of more intense you know sprinting a few times and and some kind of basic resistance training program that kind of hits all of those things based on what we know.

Um even late in life can significantly uh improve and maintain brain function. brain function. brain function. Essentially what you're saying is it's a yes and approach. It's a it's a buffet. It's not about, you know, the Norwegian, you know, protocol necessarily. That's one piece and a larger hole that encompasses every, you know, kind of form of exercise that's, you know, driving you effectively forward. So, aerobic exercise, resistance training, dynam dynamic movements, and highintensity work, right? And finding a balance and and then the very kind of like low output walking, you know, type of activity.

Uh all of these things are important for different reasons that that impact the brain in different ways and if you want to be as comprehensively brain healthy as possible, you have to uh you know attune yourself to all of these different forms of activity. Yeah, there's a there's a couple of important takeaways there. One, um first it's worth mentioning that uh we want as much as possible, we want to avoid this kind of like medical what Daniel Leeman calls the medicalization of exercise, right? right? right?

And this happens when I I site a specific study and you're like, "Oh, well then I have to do Norwegian 4x4 like to benefit my brain." But like that's not that's not the case at all. It's It's It's there's a lot of confusion around Norwegian 4x4. It it and it all tracks back to our, you know, our our deep-seated need to, you know, reduce these things down to like a little nugget that I can remember. I mean, you were a rower, right? So, as a swimmer, any as any track and field athlete or rower or swimmer can tell you, you do all kinds of interval work.

You're always varying, you know, that program. And I think the Norwegian 4x4 is a is an effective like uh, you know, interval modality, but there's many more that and and once you acclimate to that, then you you need to change it up, right? or you're not actually stimulating your physical body in the way that you could be if you're changing the structure of those interval workouts. workouts. workouts. Yeah. Exactly. And and so I think if we just think about the physiological response to that kind of thing, heart rate goes up, you release lactate, it's kind of like you're at that high level of intensity, you have rest periods in between.

So you work hard for a short period of time, you rest in between. That's essentially it. You're going to be driving those those physiological responses. if people need like specific protocols like I I provide several in the book that have evidence behind them but in reality it's just move really really quickly rest a bit um that's going to be you're driving those functions um then the the the other thing to kind of take away is that there are sort of these core um principles across all these different types of activity but how you choose to do that is entirely up to you um because you'll get similar benefits from dancing or bminton or um even your martial arts jiu-jitsu right because it is doing all those same things in terms of like the pathways it's activating.

So you can pick one that you enjoy and you want to get better at. And so like you said it is a smorggas board and you get to pick and choose and choose and choose but don't enjoy it too much or you're going to get stuck there, right? Like that's the thing with me like you know do I really want to you know play pickle ball? No. I I want to go do the thing that I know how to do. You know what I mean? I don't want to you know I don't want to be bad.

Yeah. Yeah. So, so then of course we go back to the previous thing which is you try and find something maybe where you've got some something to learn. You're going to you sort of lean into that little bit of discomfort especially in the complex coordinative stuff because I think that's going to give you extra bang for your buck on the resistance training uh aspect of this. Um there's a lot of discourse now around longevity extension and the importance of maintaining your muscle mass. So when you think about resistance training, what's more important?

Muscle mass or is it functional strength? How do you parse those two ideas? In general, your strength is proportional to your muscle mass. Um so when you're building one, you tend to build the other. As we get older, um often you train strength more than you train muscle mass. But in reality, what you want is to sort of like the the sort of like the the immediate benefits like just like moving your having having muscle and moving it, right? We release things that go and support support the brain.

It's important for blood sugar regulation. Our muscles are our biggest like blood sugar sync for most people. I think that any kind of resistance training is going to get you both at the same time. When there are some interesting like population studies where they look at strength and they look at muscle mass and they look at the relationship to dementia or heart disease risk or mortality risk and what you see is that at high levels of muscle mass you almost start to see risk increase again.

Um so what so like there are some there have been some studies out there that say that at very high levels of muscle mass you have a higher risk of cardiovascular disease a higher risk of um all cause mortality. The problem is that those studies don't determine how you gained that muscle mass in the first place. So if you gain that muscle mass through resistance training and exercise, your muscle mass increases in line with your strength. And we know that strength um you know at high levels of strength you don't have an increased risk of disease.

Like the high the higher your strength the better essentially. essentially. essentially. So what you're seeing at the population level is that some people just gain more muscle mass because they've gained more total mass. But that's not functional muscle in the same way as that if as if that muscle was gained through resistance training if that makes sense. So, I think the the real kind of takeaway is building strength that's functional and provides relative strength for you. You just need to be strong enough for yourself relative to your own body size, whatever that body size is.

Um, and so if you're, you know, larger or smaller, you would you would expect on average be um stronger um or if you're larger, you would expect expect to be stronger. if you're getting to the point where um you know you've gained a lot of muscle mass but gained a lot of muscle mass but it's not through exercise that muscle may not be functional in the same way. So the the easiest way to measure this to kind of like give a takeaway is that strength is probably more important than muscle mass.

muscle mass. muscle mass. Um and when you work to improve your strength you will also improve muscle mass at the same time. sort mass at the same time. sort of like a final important particularly if we're thinking about as we getting older is you we we can measure multiple things. We can measure mus muscle muscle mass muscle strength. So like how much like the maximum you can uh lift but then also things like power. So like how fast can you contract fast can you how fast can you contract and and move your muscles and things like power are are lost the fastest.

And that's important because when you lose the the the muscle fibers that are associated with greater strength and power, um that's where you stop being able to like stop yourself from tripping over or grabbing onto a handrail if you're about to fall down. And and we know then the the knock-on effect is hip fractures and spending a long time bed bound where you then lose even more physical and cognitive function. It's really hard to come back from that. So in addition to just like any kind of weightlifting I think which is going to improve strength um there's really interesting studies on like jumping in older adults just like a minute of jumping a day significantly improves like bone mass and and muscle strength and power.

Um, so in addition to just like the kind of like say using weights in the gym, just finding something that requires you to jump, you know, uh, you could be skipping ropes, um, it could just be like jumping on the spot, jumping on one leg. We know those have additional benefits because you're maintaining some of those elements of function that we know are going to be important. Yeah. Interesting. Um, yeah, if you are weightlifting like a bodybuilder, but you're not thinking about speed, acceleration, acceleration, acceleration, uh, or compound movements, like don't we sort of want to be like Ido Portal or, you know, take take Kelly Starret's advice and make sure that we're supple and able to, you know, bend in all the right ways and move quickly, laterally forward, backwards, and all these sorts of things that just a, you know, straight straightforward weightlifting, you know, and the tradition of bodybuilding, um, is really not going to do the trick.

So, luckily, I I don't think those things are mutually exclusive. Actually, you know, doing even traditional style bodybuilding work can help to maintain um mobility and and stability. So, if people are just getting into resistance training for the first time, the safest and easiest and best way to do it is to train like a bodybuilder. Um, and that could be a combination of compound or machine or um, you know, dumbbell bands, anything like that, you're going to significantly improve strength. You're going to maintain muscle mass or improve muscle mass.

You're going to improve types of muscle fibers. These are the ones we know are important for, you know, um, strength and power. um and the injury risk is super super low. Of course, you're then hopefully doing all these other things that we mentioned that require you to um you know have some element of um you know flexibility uh stability, cutting, jumping, running if you're doing some kind of bull sport or team sport, you're doing a martial art um because those things are important as well. But even you especially if if people are new to it, even bodybuilding style training is going to give you a number of a number of those benefits.

So I don't I don't think that we want to avoid it entirely because the the evidence that we have from randomized control trials for like what type of resistance training significantly improves brain structure and function in older adults is that like super super basic bodybuilding style training. style training. style training. Interesting. Interesting. Interesting. This podcast is brought to you by Squarespace. You know it, you love it because Squarespace is the, not a, the all-in-one platform for building a website and growing your business online. Here is something I've observed over the years.

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It was called Go. And it was all about taking inspired action in your life. And I had no idea that something from that day would land so deeply with Joe, the founder of the event, or that it would eventually become the spark for his next mission, which is reimagining what social drinking could look like. What impresses me the most is how seriously the entire team at Go takes their craft. These guys spent years testing thousands of batches in their lab and the results reflect that. They've received gold and silver medals at the best of craft beer awards in the past 2 years.

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Danger zone. Danger zone. No matter what you say, you know, you're going to get [ __ ] from people. U But I like the fact that you've done a great job of not being reductionist here. You're not talking about any particular diet being the best. And you have a principled approach to how you think about uh the the the way we should be thinking about what we put in our mouths. So how do you want to kind of introduce how you think about food? So I I think about food in in terms of sort of three three again kind of inter interacting um uh features of of a diet say and those are the nutrients, the energy and then the pattern of the way that you eat that allows you to maintain um good intake of the nutrients that you need as well as um adequate energy intake.

um in the the the kind of the modernized westernized world. I think energy availability is probably the the right now seems to be the most important lever that we need to consider when it comes to to long-term brain health. Mainly because of all the things that we talked about earlier, right? We know that there's an increasing rate of pre-diabetes, metabolic syndrome. These come with high blood sugar, high blood pressure. These are significant risk factors for dementia. We know that people who have metabolic disease have an increased risk of multiple types of dementia.

And this is something that really we're at risk at at a population level because of the of the food environment. You do see and this is relevant to to athletes and and longevity pe sort of focused people as well. you see this like bell-shaped curve between curve between curve between the amount of energy that we have in our bodies, amount of energy availability we have in our bodies um and the sort of the structure of our brains um something we call brain reserve which is essentially um a fancy way of saying how much brain do you have in your skull um and the more the better usually.

So at the high end we know we have lower brain reserve, higher risk of long-term cognitive decline and dementia. We see that uh based on blood sugar or blood pressure um or um you know like central central adoposity like a high waist to hip or high waist to height ratio. But we also see the same thing at the low end and this has come from sort of big population studies across multiple populations around the world including some huntergatherer populations where they don't have access to the kinds of calories that that we do.

Um, but this is very relevant to sort of like athletes and the longevity groups because you see that if you have low energy availability and you'll probably have maybe experienced this yourself or you've experienced it with other athletes you've worked with, we know that low energy availability or relative energy deficiency in sport uh reds or red s is associated with significant changes in cognitive function, mood, sleep and it's sort of like the population level those who have you know low energy availability have tend to have smaller brains because they just don't have the energy required to maintain that much structure of the brain.

So this is relevant for those who are doing very high volumes of exercise, I think, but it's also relevant to those who think that chronic caloric restriction is like some font of of longevity. And I I think that we have evidence to say that's probably not the case. um you need to get enough energy in that you you remain um weight stable whilst maintaining strength and you know strength, performance, fitness, all these other things that we know require some amount of energy. Um so like chronic restriction is is potentially going to be uh bad there as in addition to chronic excess.

If we're sort of like attending to our energy needs, then the next important thing or you know which we know is equally important at least sort of on a g global scale is is nutrients that are essential for brain function. So these are all the things I mentioned earlier are the ones that we have the best evidence for. So um iron status, vitamin D status, omega-3, the B vitamins associated with um methylation. So the ones that affect our homocyine level and homocyine goes up as our need for these um B vitamins goes up.

So if we have inadequate levels, homocyine tends to go up and so that's B12, folate, uh B6 and rioflavin, which is B2. Um and then on top of that, you know, we we know there's important things related to antioxidant polyphenols. So the things that make berries um purple like the anthocyanins or we see similar compounds in coffee and tea um which are associated with a lower risk of dementia at sort of moderate consumption. Chocolate uh the roasted uh skins of nuts and seeds have like similar compounds in them.

Then there's things like luteine and zeazanthin that make your peppers and carrots or make your peppers red and yellow. Um the the carotenoids including like betaarotene in in carrots. Um and then things like aazanthin which makes salmon and shrimp pink. Um all of these have sort of like similar benefits. Um or and in terms of they they affect gut function, affect vascular function and they can um uh improve brain function. Some of the best evidence is for uh blueberries or like dark berries. Dozens of studies showing both uh acute and chronic benefits in terms of cognitive function with with berry with berry intake.

And then uh yeah, some of the antioxidants things like vitamin C, vitamin E, um uh uh magnesium and zinc crop up frequently as well. All of this to say that I call nutrients the great leveler. Like these nutrients are important. I want you to have enough of them. I don't mind where you get them from and I don't think I think that matters much less. To your point of not caring where you get them from, do you care if they come from the whole food versus supplementation?

I would prefer if they came from the whole food. Um, and I think the the best uh example of that is is seafood. So when we look at omega-3 status and dementia risk in general, it seems that sort of like the pop, you if you're doing epidemiological studies, those who, you know, regularly consume seafood have a a greater reduction in their dementia risk than those who take omega-3 supplements. That's probably because there's a whole bunch of other stuff in there that's important, right? So uh selenium um you maybe as you if you're eating salmon or shrimp you're getting asanthin as a as a as an antioxidant and in general the the our diets are relatively poor in in in many of these antioxidants I mentioned.

Um you know protein if you if you need to if you're not getting enough protein in your diet. So and there's a whole bunch of other stuff. So there's this nice um uh phrase which is nutritional dark matter where it basically acknowledges that like 90% of what's in your whole foods we have we don't know what it is and we don't know what it does. Um there's uh interesting compounds like ergoionine that you get from mushrooms that's like the new longevity supplement because it does a bunch of cool things.

Um but we're only just learning about them. So when you get it from the whole food you're kind of stacking the deck in terms of there's some other stuff in here that may be beneficial too. However, there are studies where if you supplement with omega-3s and you're omega-3 deficient, you see significant improvements in cognitive function and the rate of cognitive decline. Um, the omega-3s in particular interact with B vitamin status. So, there are multiple studies that show that if you supplement with omega-3s, but you have poor B vitamin status, then you don't benefit from the omega-3s.

And vice versa, if you supplement with B vitamins, but you have poor omega-3 status, you don't you don't benefit from the B vitamins. And I think this is where reductionism has gotten us in trouble in supplementation um studies, which is that we we give thousands of people one supplement. We're like, "Oh, hey, it doesn't reduce dementia risk. Therefore, it doesn't work." Well, you didn't measure whether they needed it, and you didn't measure the other things that that um that supplement is dependent on. So, one of the reasons why I think it's safer to get things from whole foods is because you're getting these other nutrients at the same time.

But with that said, if you're somebody who doesn't consume seafood or, you know, any other source of longchain omega-3s, I know that there's benefit from you supplementing uh from it. So, that's kind of the the approach that I I would use. Yeah. Yeah. Yeah. Yeah. That makes sense. I'm going to have more questions about these pillars, but let's get through them. So, we talked about energy, we talked about nutrients, um and then the other pillar here is pattern. pattern. pattern. Yeah. passen is just finding a way that you can achieve um adequate energy intake and good nutrient intake in a sustainable way for you, right?

That's either um what you can afford, what you have access to, what's um makes sense for you uh culturally or locally um uh financially. And I think that there are innumerable ways to to skin those cats. It's just making sure that you're kind of hitting those targets in a way that's sustainable for you. So that's why like pattern is that last part because right when we take a supplement we usually take it for a month and then we forget to reby it. We never take we never take it again.

But this is something that's going to be important long term. So finding a way to make this sustainable, enjoyable, nourishing um like that's where pattern you know really becomes important. setting aside this diet versus that diet and returning now to this notion of energy. You mentioned that there is a certain cohort cohort of people in the longevity community who you know are are under the impression that like chronic uh under fueling is some secret to unlocking health span extension. But the vast majority of people are overindulging.

You know, we're in this world of over overabundance. Everybody's eating too much. Everybody, you know, is a little overweight, if not a lot overweight. So, we can sort of set aside, you know, those longevity people and focus on the average person. average person. average person. Uh, and one of the things that I thought was really interesting that you said, which is overeating shrinks the brain. Yeah. Yeah. Yeah. So, explain that because we're all overeating. Yeah. There's definitely um like a step a step in between. Um, but we know that even in short-term overfeeding studies, right, and this is usually done with some version of a western diet, they add candy bars to the diet or they make you eat an extra like serving of French toast or waffles every day for for like even a week.

You can start to see changes in um both mood and say h like hypocample function, memory function. This is in this is in in humans. this then you know long-term translates into what we see in the large population studies which is people who have um higher markers of what I call excess energy availability um and so that's essentially the markers of metabolic syndrome um those are the ones we have the best evidence for so a high waist circumference low HDL cholesterol high triglycerides high blood sugar or high blood pressure these are all significant risk factors um for dementia and they are direct direct measurable effects of chronic excess calorie consumption.

They are like the the outputs of excess energy. energy. energy. This this is what hundreds of millions of people are you know if they had their blood work done it would reflect those very things. very things. very things. Yes the depending on which estimate and which data set you have something like 10% of US adults don't have any of any of the um uh components of metabolic syndrome. you need um uh three to five to to technically have metabolic syndrome, but probably less than 10% don't have any of them.

High blood pressure, elevated LDL, elevated triglycerides, LDL actually isn't in the LDL is one of the modifiable risk factors in the dementia prevention reports about so LDL and and cholesterol APOB are important, but they're not in the metabolic syndrome criteria. criteria. criteria. Okay. So given the fact that we're overindulging on food and a lot of these foods are we're not overindulging on whole foods, we're overindulging on ultrarocessed foods and just you know a bunch of crap. And I know just as somebody who's always trying to make the right choice when I'm not at home where I have control over my food, I'm traveling or you know I'm at a restaurant or whatever.

Like it's very difficult to really eat well because even if you order the salad, there's too much dressing on it or they load it with all kinds of other stuff to because they think that's what people want in order for it to taste good. Like even the healthy choice is compromised. So you're really going against the grain to try to, you know, do the right thing unless you're in your, you know, kind of personal controlled environment. I I think that's absolutely right. And the the way that I would think about this and and think about you know everything that we have talked about and will talk about today is that as much as possible you know control this environment at home right.

So if you um you know, however it is that you eat at home or that you would you would like to eat um figuring out how you can um access those foods, cook them, you make them a part of your your diet in a sustainable, enjoyable way, right? Or and it's the same with exercise, right? You have your routine, you play your pickle ball, you you go and you lift your weights. your weights. your weights. um so that when you do go out into the world and these choices are harder, it matters much less because this stuff integrates over really long periods of time, right?

So one meal out doesn't make that much of a difference. And we get to the point where like I have friends where you and you know historically you go you you know when you're in this health kind of world you know everybody goes out to dinner after a conference and right everybody's stressed about what they can or should order at the restaurant right and I think we want to avoid that because it's a net negative right just like in in enjoy the moment with the people and like what you eat that one time makes much less.

This is the flip side of, you know, these kinds of conversations because we're basically, you know, pushing people towards this optimization mindset mindset mindset where it's impossible to live up to the standards that are being articulated and that leads to guilt and shame and stress and all these other things that are obviously, you know, cross purposes with the aim. the aim. the aim. Yeah. No. And I I think that, you know, a lot of what I write about in the book is the psychology of how we approach this kind of health information because that's exactly what I want to avoid.

I don't want people to feel like they're not doing enough. Um I mean, and we know that people need to do the work, right? We know that you need to find a way to kind of have this sustainable but nourishing diet that gives you the nutrients and that you're not overeating. And we know that you need to, you know, create some kind of cognitive stimulus so you need to lean into the discomfort, right? We know that you have to do those things, but if you get to the point where you're constantly feeling like you're not doing enough, you're not doing well enough, you need to do more, that's an inherent stress in its own way that that then negatively impacts your health.

And we have study to studies to support that as well. So, I think it's it's all about doing what you can and like moving things forward and like improving things over time, but then once you've built a foundation, the occasional thing matters much much less. Um, and the goal would be to avoid getting really stressed about that, right? I've spent most of the last 3 months on the road. I can't eat. I can't work out the way that I would that I normally would, but I know I can't sleep the way that I normally would.

But I know that I've created a good foundation by having, you know, my base at home to do, you know, when I when I can do these things. And then the rest of the time, like the thing when I can't control it, I I try not to worry about it because I know that there's knock on effects about of that worry as well. On the nutrients uh side of things, you talked about the importance of omega-3, B vitamins, uh antioxidants in the in the berries, etc.

What are some other foods that are brain health promoting that people can just like, oh, I I can remember that and I'll make sure I incorporate that into, you know, tomorrow's dinner. Yeah. My two favorite sort of brain health foods are sardines and blueberries. um don't have to be eaten together though it's it's an option. Um like so like luckily if you if you eat a varied like whole foodbased diet um so there's a lot of I talked about interesting structural compounds like um choline and ethanolamine you can get those from eggs but you can also get them from oats and quinoa and other whole grains similar with like uh phosphotidylcerene you can get from and and phosphylcodone as well you can get from from soy products any of the sort of like colored vegetables are going to give you some smogers board of those different antioxidants.

Um we also know that that fiber is really critical, right? It's going to support um gut health. Um and then sort of fermented foods in that category as well. So sauerkraut, kimchi, fermented dairy, um those will sort of like fit into that picture as well. And then like whatever your preferred protein choices are. Um I think most people probably overeat on the like refined carbohydrate side. Like we don't need tons of rice, we don't need tons of pasta. Um, I would focus on the things that sort of those other because they're not particular they're both calorie dense um and relatively nutrient poor.

nutrient poor. nutrient poor. Um, so focusing on those other areas um I think is going to give is going to make you more satiated as well as giving you sort of more sort of nutrient bang for your buck. As somebody who's been plant-based for a very long time, uh other than the sort of obvious, uh things that I need to be aware of, making sure that I'm supplementing with uh an omega-3, um what else should I be uh focused on or thinking about? And the B vitamins, obviously.

Yeah. So, those those are those are the two that that I' and and you can just measure, right? So, measure your homoyine level. The goal is to be at least below 13, ideally below 10. uh you can measure your omega-3 status. So omega three index at least above six, ideally above eight. The other thing where it's just it's common particularly as as people get older to not consume enough of is just making sure you get enough high quality protein. Um especially as people get older, they get more frail or they experience a metabolic disease that's associated with a faster loss of like muscle mass and strength.

Um, and there are randomized control trials that showing that that show that increasing the amount of protein you eat to sort of actually what is now the target level in the the updated dietary guidelines that's actually in the in the trials is associated with better maintenance of muscle mass in in sort of older in older adults. So that's the only other thing that I would those Yeah. So B vitamins, omega-3s, protein are the ones that are maybe easiest to to to miss out on. The protein recommendations just seem to continue to go up.

I can't I've never been eating protein at that threshold level. I think I've always been eating less protein. I still I I really don't have trouble putting on muscle mass. It's like I've now recovered enough from a spinal fusion surgery I had this past spring where I'm in the gym and I'm noticing gains pretty regularly and I'm not really that focused on protein despite hearing from people like you all the time who are like you need to be you know one gram per body weight like I'm way below that but then I'm I'm like is it is it does it m I mean I'm hearing this obviously there's evidence to support that I should be thinking about this differently, but I haven't been.

So, there's well, there's a few there's a few different parts that get that that go into that. So, the the first is that in the context of a calorie dense nutrient poor diet, we know that protein is a lever for society. So, um people will continue you, this is some of Kevin Hall's work, right? People will continue to eat until they they some of it will be some some protein threshold. So, one reason to focus on protein is that it's maybe going to help you overeat less, right?

that's less of that's not that's not an issue for you, but a population level that can be important. Um, it's also particularly important as people start to age and experience frailty or psychopenia, right? That's the context I was talking about earlier. Again, that's not as relevant to you. But I'm at that age where it is harder, you know, and you're just like, well, this is taking a little bit longer, you know, like, so maybe I should be, you know, focused on on my protein. You do see that in old adults and now people in their 60s if they consume again at that sort of level of protein.

So like 50 to 100% above what was like the previous dietary guidelines. So that was8 grams per kilo of body weight. Now we kind of think targeting 1.2 to 1.6 g per kilo of body weight. At that level you also have higher like antioxidant status which we know is important in terms of dementia risk factors is important for recovering from exercise as well. And then you're right, as you get older, like even if you're doing everything right, you're more likely to experience um anabolic resistance where you just need a greater protein signal or more of a training signal to kind of, you know, benefit from that exercise.

So, it's probably worth you considering increasing um intake up to somewhere in that kind of range. Um the but the final thing I was going to say is that when it comes to muscle mass and strength, the most important thing is still stimulus, right? So, um, yes, eating more protein will prevent you losing muscle mass. If you're not, um, if you're not regularly doing some kind of resistance training, but resistance training is still going to be the most important thing. But, you know, as you get older, I think that requirements are going to increase a bit.

On the topic of omega-3s, omega-3s, omega-3s, uh I've had I I couldn't even count how many conversations with people like yourself sitting across the table, uh you know, discussing the finer points of of you know, how to supplement properly. And to this day, I will admit that I still don't quite under like there's DHEA and there's DHA and there's EPA and like I still don't understand like when I'm looking at a supplement like what are the levels I'm supposed to be um looking for? How do these things interact?

And as a plant-based person, what maybe should I be thinking about that an omnivore isn't in terms of the effectiveness of of the supplement? Interestingly, I would say that the majority of omnivores probably aren't eating enough omega-3s either, right? Because they're just like people just aren't eating that much seafood. So, I think this is relevant to most people regardless. I will say that we and by we I mean like well-meaning health focused scientists like me, I think we've over complicated it a little bit, right? So the the the two main omega-3s that we might think about are Yeah.

DHA and EPA. Uh there's also things like DPA which occurs in sort of smaller quantities. Here we go. Yeah. Right. So yeah, literally so like but but what I'll say is that like all of these are important. Most omega-3 supplements are going to contain DHA and EPA at a minimum, right? And that's where we have some evidence from like giving people these supplements. If you're not regularly consuming seafood, any kind of supplement, you know, and assuming like high quality, you get it from a good quality manufacturer, right?

because these things can be, you know, poorly processed and they become rancid and oxidized and things like that. You know, assuming it's a reasonable quality supplement from a a respected uh manufacturer, manufacturer, manufacturer, something that gives you 1 to four grams of total DHA and EPA a day is probably good enough. Four matters much less. Like people have talked about triglyceride form versus phospholipid form and you get one in seafood and you get another in like um sort of krill and things like that or this is high in this but it it doesn't convert like there's this conversion thing right.

Yes. Oh yeah. So the the conversion part is the is the shorter chain omega-3 fatty acids like ALA alpha lino alpha linic acid which is what you get in like chia seeds and walnuts and things like that. most people and actually um the conversion is worse in men on average than it is in women. Most people if if you only get omega-3s in that form, most people won't convert enough into the longchain form. So that's why you need to supplement. to that's why you need to supplement.

But I think in general, if you're getting a couple of grams of longchain omega-3s from a high quality supplement on average a day, right? That's it. I wouldn't worry so much about the ratios. wouldn't worry so much about the total amounts because you're then going to be ticking the boxes that you're that that you're close enough and you're also well beyond what most people are consuming. Then the easiest thing that you can do is measure something like an omega-3 index which just measures the amount of those in your blood and say am I close enough to a level that we know is associated with lower dementia risk which would be sort of 6 to 8%.

Well, like above 6% maybe ideally above 8%. So maybe that simplified it a little bit. I think that um we we know that DHA and EPA are both important. You're going to get both from any supplement. The real problem is people consuming none. Like once you get to the threshold of consuming some like you more than a gram a day on average, right? You're already like in a much better bucket than than most other people. We're tiptoeing towards uh a longer discussion around supplements and what's effective and what isn't, what's nonsense.

Um, but before we do that, while we're still on food, let's talk a little bit about the worst offenders. Obviously, we know ultrarocessed foods aren't good for us. Um, but what are some maybe less intuitively uh, you know, bad things that we should avoid? You'll notice that I work really hard to not like demonize anything in particular because it makes things tricky cognitively for people and like nothing is black and white. Um so I I'll give one broad example which is that uh the levels of homocyine in the US in general particularly high homocyine which is a so like above 13 which is associated with increased risk of dementia that significantly improved since we started to fortify flour with folic acid in in 1998.

heavily processed foods can can almost be beneficial in one way because it allows us to add back nutrients that the population is is missing, right? Um, but in general, I think the, you know, anything that's full of refined fat or refined carbohydrate that's so calorie dense and nutrient poor. So that's, you know, kind of all of the the baked goods, snacked good like snack goods, things that are you very easy to overeat. um and are designed to you know for that to be the case. Um it's not that you can't include these and it's not like I avoid those things completely but you have to think about them in that goal of overall energy you know balance and nutrient intake.

So like you're eating more of those things you're you're sort of like pulling away from your nutrient goals and you're also kind of heading towards the risk of of overeating. So that like that kind of um yeah the the heavily processed carbohydrates and fats are usually where things get trickiest. Um so you know fried foods uh baked goods uh sweets sodas that you know sugar sweet and sodas that that kind of stuff. Then a big trap that's now easy to fall into is when some something's like hey eat these protein like Doritos or eat eat this protein candy bar.

it's still a candy bar. Um they've added a little bit more protein, but it's not getting to the point where it's actually going to meaningfully move the needle and you're very likely to overeat it. Uh same for Oh, hey, these these um these brownies are keto or these brownies are like plant-based or vegan, right? They're still brownies, right? Yeah. And they still have, you know, 900 calories or something like that. Setting aside the keto thing, like sugar Yeah. I mean you can kind of I know you don't want to vilify any one thing but you know is there really a place for refined sugar in any kind of healthy diet diet diet in the context of all those other things like occasionally consuming sugar is is fine right but you have to maintain those those other those other components um and it's it's likely that if you're consuming sugar at the level that's going to be associated with overeating um you know and these other like metabolic health conditions um you're very unlikely attending to those two things.

So, it is possible to, you know, occasionally consume sugar, be in like be in a good energy state and and overall have a very nutrient-dense diet. It's just that the more you shift in that direction, the harder those things those those things become. So, you know, I will occasionally eat dessert. I don't I'm not particularly sweet tooth, so I don't eat a ton of it, right? But because I know I've got those other things handled, I'm less concerned about it. So what you often see is that particularly as you get to like processed or packaged foods, something will be sold as like low sugar, but it's still energy dense, it's still nutrient poor, that kind.

So like it becomes a thing where we can go, oh, there's no sugar in this, but actually it it doesn't make it any healthier. Um, so that's that's why, you know, again, we become kind of over over reductionist. Um, so not something that I think that you have to completely avoid, but the more you're consuming of it, the less you're likely to kind of hit those other things that we know are critically important. critically important. critically important. Sure. Uh, one of the things that you see in the longevity community online is, uh, you know, this this notion like, oh, if you you've been really good and then suddenly you have a dessert, it's like, oh, I feel awful and I could, you know, I couldn't sleep tonight.

And it's like how resilient are you actually if you're so disregulated by this, you know, this one kind of like indulgence. The I think that's a really I think that's a really important point and I would my guess is that so so yeah like your we know that your gut microbiome will kind of adapt to the foods that you regularly give it. So like if you give some so like you know I had family members who were vegetarian for a long period of time and then you know it's sort of harder for them to eat meat later because their body just hasn't adapted to it right and we know that there's some shifts that can happen in the gut to kind of support that.

Um and so the same might be for large boluses of of sugar. Um, but I think a lot of where that comes from is because and we've we've made this worse with the uh advent of like continuous glucose monitors and stuff like that is you're like I know this is bad and I expect it to be bad and therefore I feel bad because of it. Um whereas if instead we thought I'm just going to very occasionally I'm going to enjoy this dessert. I'm just going to enjoy it.

I think you would experience a very different physiological effect from it which gets into mindset and the role that mindset plays in all of this which you talk about in the book as well. Yeah. The um so so one example that we have that that you can use here is there's a study by Ellen Langanger which um looked at diabetics and you brought them into the lab and because they're they're diabetic um they're obviously very cognizant of their sugar and and carbohydrate intake. They brought individuals into the lab and they gave them a milkshake and they like look at the um um the nutrients on the look at the um um the nutrients on this on this milkshake.

There was a high sugar milkshake and and a low sugar milkshake and then they measured their blood sugar and the blood sugar was much higher after the high sugar milkshake than the low sugar milkshake. Like of course as you'd expect the problem is this is the same milkshake. So the stress of anticipating a blood sugar spike which they know is going to affect their health, right? drove their blood sugar up even higher. Um, and so this is, you know, every time we approach anything like this and we think about um, this is going to be this is going to be bad for me.

This is going to be, you know, you might get some benefit, you think it's going to be good for you. But in general, we see that if we think something's going to be good for us, it has like a neutral effect. If we think something is going to be bad for us, it has like a like a negative a negative effect. This then uh translates to all the other ways that we can think about health information. So I mentioned earlier that thinking that you're constantly um not doing enough can negatively impact your health.

And there are some studies that suggest that when you ask people how much exercise they're doing compared to people like them and you look at um those who think they're doing less than less exercise than people like them, as much exercise as people like them, or more exercise than people like them. People who think they're doing more exercise than people like them tend to live longer and they have better cognitive function. However, this is after you adjust for how much exercise these people are actually doing and they have like um they use like activity monitors, right?

So, there's this there's and the people who think they're doing less end up having like worse. worse. worse. If you're just a narcissistic sociopath who thinks you're better than everybody, you're you're you're there's something screwed up. Actually, there's like true. It's like your mind is creating your reality and if you're like I'm doing great then you are creating you know your own version of greatness in your life to to an extent. So there is some benefit of this sort of like ignorance ignorance is bliss almost right.

So like this is the and you you've already said this like this is the risk that we run by sort of overanalyzing health and lifestyle lifestyle lifestyle because everybody's walking around let's face it everybody's walking around thinking they're not doing enough and they're falling short. Yeah, if you have a social media account and any kind of fitness or nutrition stuff happens to come up, we're all judging ourselves against some imaginary standard that we're not even close to living up to. So, every choice that we make is a choice of falling short of what we feel like we should or could be doing.

And so, when you aggregate that over time, what is that doing to our mindset? We're always in a place of lack. Mhm. When you look at things like uh self-compassion um which you can break you break down into multiple components of self self-kindness u mindfulness and common common humanity. You see that and this is relevant again to like athletes and to and to to like the health of the general population. Um athletes who are more self-compassionate tend to be more resilient and tend to perform better over long periods of time because they understand the nature of setbacks.

They understand that we're just humans and they treat themselves like they would treat other people and then that allows them to learn, do better, come back and and perform again. People who are self-compassionate in the chronic disease setting tend to have better health outcomes for the same reason, right? They understand that, oh, you know, I didn't necessarily eat the way I that I, you know, would normally do or that I I didn't sleep or exercise the way I normally would, but do you know what? I'm human.

I'm going to come back and I'm going to do it better next time. And like overall they tend to see uh you know when they do uh interventions that improve self-compassion they tend to see better health outcomes. So like better blood sugar and blood pressure in diabetics who are kind of taught about self-compassion. So um what we're kind of told which is that we always need to do better. We always need to be telling ourselves we're not doing enough. we always need to be pushing through, right?

It's actually the exact opposite of what creates um a sustainable and well-being supporting mindset, which is that yes, I know I can improve. Yes, I know there are these things that I can do, and I'm going to celebrate the wi like my wins. I'm going to celebrate. I'm going to enjoy that feeling of discomfort. I'm going to enjoy the fact that these things are improving, but acknowledge that you can't make everything perfect. You can't optimize everything. Um and, you know, we'll slowly get better over time.

And then not only are you engaging with the things um that you know will improve your health, but you're also maximizing the likelihood that you'll benefit from them because you're not spending the rest of your time beating beating yourself up that you're not doing even more. more. more. I feel like you just said the quiet part out loud. And perhaps the most underappreciated underappreciated underappreciated aspect of of all of this, not just for brain health, but overall health in this epidemic of loneliness and isolation and disconnection and, you know, kind of a decline in our overall, you know, mental health from on a population level.

A lot of it stems towards this sense that we're not enough. You know, that we're u not good enough and you know, we have to go out and you know, earn belonging and acceptance. Uh and perhaps the greatest lever for longevity and brain health is adopting a loving kindness meditation practice. Like, yeah, we could talk about omega-3s, but if you hate yourself and you and you and you think you're, you know, nothing's ever going to work out and so and so is always going to have more whatever, you know, whatever negative frame that you perceive the world.

Uh, you can supplement with as much DHA and EPA as you want, but ultimately uh you're kind of driving yourself towards the grave. as much as it is a counterintuitive concept that like the most successful athlete is the most self-compassionate athlete because you do think like well it's the person who's like I'm I'm you know I'm never satisfied and like I'm just hard driving and that's all coming from that place of of lack and not feeling enough right like this compulsion to compete from that negative frame as opposed to like this is awesome and I'm doing it from a place of joy and selfhonoring you know so it's a mental health issue as much is it's a physiological issue.

physiological issue. physiological issue. Yeah. This is why you know so much of the the book focused on the psychological aspects because I think that that that like you said the the things that are important we already have some intuition about right may maybe reframing cognitive stimulus is really important but like we know exercise is important. We know that diet is important right we know know know it's not an information problem. It's It's not an information problem. It's how we approaching that information. How are we speaking to ourselves?

how are we engaging with that information and applying it to ourselves? Because, you know, we've been told that um you know, if only we weren't so if only we weren't so lazy, we could look a certain way or perform a certain way. But it's really it's really not about that. It's all about how we treating ourselves that even allows us to start to engage with that information in a way that will benefit us. um but also that make you makes it sustainable and supports well-being and you know hopefully belonging and purpose and meaning and all these other things as well because I guarantee that the the the best way to minimize your risk of dementia is not sit at home uh by yourself chugging supplements um despite what some people are trying to sell to us.

Um it's going to be much more about how you treating yourself and how are you interacting with others that then allows you to do some of these things almost naturally. It is uh the western frame of mind though that the solution is in a pill or a capsule. this this this sort of sherking of taking personal responsibility like I if I just eat this or I take this stack right then it will take care of it for me as opposed to what you're advising and what your book is all about which is shouldering personal responsibility for a lifetime commitment towards the principles and the pillars like the foundational aspects of what drive health even even beyond that it's I think that we And we can almost think about um shouldering a societal responsibility for that as well because um what you the people who who have the the time and the resources and the ability to think about taking the supplements to kind of you know get you kind of hack know get you kind of hack their way into better brain health.

They might not realize it, but they're already at such a privileged and advantaged position when it comes to their long-term dementia risk because we know that socioeconomic status and deprivation and not having access to education and healthcare, these are some of the biggest drivers of of long-term dementia risk. So, not only is it, yeah, how do we treat ourselves and how do we engage with this and shoulder some personal responsibility, but I think that we could even expand it beyond that to how are we engaging with society in a way that minimizes or improves this risk for other people who maybe don't have the same kind of access and availability and time to do some of these things.

these things. these things. Let's do a little truthtelling around supplementation. supplementation. supplementation. Okay, Okay, Okay, responsible supplementation has its place. What can you tell us about what's effective versus the perception of what's effective? what's effective? what's effective? Um, well, the the first thing you could say is that if you think it's going to help you, it might because we know back to that that's an Ellen it's Ellen. It's all about Ellen Langanger. Yeah. Um, there was there was a point when my editor told me that I reference too many Ellen Langanger studies in my book, so I had to take a couple of them out.

Um, she's but why not? I say more Ellen Langanger like you know she's amazing. Yeah. Incredible. Um absolutely one of my all-time favorite scientists. Um but where I think we have solid evidence is is essentially the stuff that we've already talked about is um attending to nutrient status for nutrients that we know are critical for brain health that are either deficient or insufficient in the diet. And we know that the majority of adults around the world are deficient in at least one nutrient. So finding some way to attend to that.

So it's supplementing with vitamin D if you need. need. need. So if somebody is to go and get a blood panel done, what are the markers that you would like them to pay attention to? Again, the ones that we have the best evidence for. So vitamin D. Um you definitely don't want to be deficient, which is less than 20 nanogs per mill. Um but you ideally you're at least above 30. Um probably above 40 is is best. 40 to 60 is probably a good target range.

I was below and I started like sort of mega dozing on vitamin D and then my levels were like way too high and I was struggling to sleep and then I realized like oh excess vitamin D can impair sleep and so yeah this is and I say this just because more is not always better and you know you have to like you know really gauge how you're managing your supplementation even if you're trying to make up for you know a shortage or a low level. Yeah, absolutely.

So, and vitamin D is one of the ones where it's because it's fat soluble, it's easy to take too much, especially if you're taking like several thousand daily for long periods of time. So, yeah, definitely get above 20, maybe target 40 to 60 homocyine for for B vitamins. Um, then like I said, definitely less than 13, ideally less than 10. Um and if than ideally less than 10. Um and if homoyine is elevated then those B vitamins I mentioned earlier the the ones that they usually um give in in clinical trials is uh B12 and folate.

Um but you might also add B6 and riop and rioplavin. Um other things that can bring down homocyine might include creatine betane or trimethoglycine um potentially choline too. Then you might think about that you know are you do you have a diet that includes those things right? Betane is high in beets and coden is high in eggs and creatine is is is um high in meat and fish, right? So that might might help help you sort of like target any supplementation if you need it. Um iron status is is really critical.

Um so you would normally just measure hemoglobin level, but then there are a whole bunch of iron metrics that you take along the side to kind of help you interpret it. So like feritin, transfer saturation, um iron binding capacity, but ideally sort of women want their hemoglobin to be at least above 12.5. um men 13.5 men 13.5 men 13.5 um but not too high. So if you're if you're like in men a hemoglobin above 17 or in women a hemoglobin above 16 makes it much more likely that you have something like especially if you're older or you have some elements of metabolic syndrome makes it likely that you have something like obstructive sleep apnnea.

Um when you stop breathing during the night your oxygen levels drop and your body makes more hemoglobin in response. Um, so cuz we know obstructive sleep apnnea and other sleep disordered breathing is a risk factor for dementia. Another reason to check your hemoglobin is because at the high end and that's something that you need to address um as well. Yeah, we already talked about omega-3 status. So um omega-3 index if you you can get it um doctors will do most of the other things that I mentioned.

Um you can u just get like an at home test for omega-3 index if you can't get it through your physician. Um so at least above six, ideally above 8%. Um and then um other things that they're important um can be harder to test. So like it's really hard to test magnesium status for for example, but um magnesium tends to be something that people don't get much of or get enough of. And we know that people who who sweat a lot or who are athletes tend to need more magnesium.

So a safe recommendation is often to think about um a magnesium supplement especially if you're if you're an athlete um so and that particularly for people who struggle with sleep there's increasing evidence that taking magnesium at night can can help to improve sleep. other things especially as as we sort of get into um some element of aging or cognitive decline there's some evidence for choline which had already um previously mentioned uh that may may be beneficial but even even then that's sort of like well apart from those others I think the the kind of the core vitamins are where where we have the and nutrients is where we have have the best evidence um then beyond that it might become very context dependent and there's very few things that I would give a blanket uh recommendation for if you're getting those blood tests, you're you're addressing those um nutrient requirements and then you're also, you know, testing your blood pressure, testing your blood sugar, testing your cardiovascular risk through your lipids, like that's the big bulk of of risk right there.

Um, anything else is going to be, like you kind of said, like sort of like cherry on the top. Creatine has been in the news lately. Uh, it went from being this thing that only bodybuilders use to sort of mainstream adoption. uh but in limited amounts, five grams a day, maybe 10 grams a day. Now we're seeing this science emerge around the relationship between creatine intake and brain health. And you know, every time I open up my social media feed, the daily recommended intake increases. It was 10, then it was 20.

I've seen people saying you should be taking 30 grams of this a day. What say you, sir? So, creatine is the only supplement outside of those vitamins and minerals that I mentioned that I actually mentioned in my book. Not because I I don't think it's magic, but there is an increasing burden of evidence that it's that it does interesting things for the brain. There's some studies after concussion where it may improve recovery. There's studies in the setting of uh particularly in older adults or what those started to experience cognitive decline, creatine supplementation may improve memory.

uh in in particular um it seems to help improve um cognitive function in the setting of sleep deprivation deprivation deprivation um and now there are several trials where they've added creatine to anti-depressants in the setting of treatment treating depression and it seems to provide additional benefit um so I think it does lots of interesting things for the brain it's also the best studied supplement and because you know 5 to 10 grams of creatine which is a fairly standard dose even five grams is sort of like longterm the standard dose you could achieve that through diet, right?

You'd have to eat a fair amount of steak and salmon, but like it's certainly possible. So, like we know that it's very safe and like we know that it has very few side effects. So, if you're going to if you're thinking about um supplements, I often think of this idea of positive asymmetry. So, like where is their potential for benefit with very low downside other than the the the cost to your wallet? Um so in terms of dose actually some of the like the first study that looked at creatine in the setting of sleep deprivation was in rugby players and they looked at rugby specific skills after you know in the setting of sleep deprivation they compared caffeine and creatine and a standard dose of creatine 5 to 10 grams depending on body weight right so a smaller person would take five grams a larger person would take 10 grams or somewhere in between was enough to see to see benefit in some of the depression trials again they're using 5 to 10 grams.

Um some of them using 5 g and seeing benefit in the like the the one most recent sleep deprivation trial which is the one that got a lot lot of press um where people were sort of kept awake for a night and then they were given creatine and it given they were given creatine and it show it showed that it helped maintain their cognitive function um in the setting of sleep deprivation. I think they were using.3 grams per kilo. So that's where somebody like me would take 30 grams um but you know somebody like you might take 20 grams.

So, um that's where like this dose escalation is happening. Um in if you look at studies where where where you're looking at creatine levels in the brain, you you start to see significant increases in brain creatine at sort of like loading type doses. So that's that kind of like.3 grams per kilo uh per day for you know a week or more. Um so that's like you know 20 to 30 grams a day. However, some of the evidence of benefit in things that are related to brain function seem to happen at much lower levels.

So, I'm not convinced that everybody needs to take 30 grams of creatine a day because I have evidence from other studies that actually maybe even at 5 grams people are starting to see benefit. Um, so the way I kind of approach it right now is the gen I would generally recommend 0.1 g per kilo. Um, so I take 10 grams every day. And then yes, if you're very stressed or sleepd deprived, maybe you you could you could try increasing the dose. So for me, as it is for some people, but not everybody, creatine is quite um alerting.

Like it feels like a very very mild stimulant without making me jittery. Like I've had a bunch of of coffee. So I can't take creatine late in the day cuz I don't sleep as well. Um, but like if I haven't slept well, I might double my dose for the day. Um but that's not like a long-term thing. So I think the standard dose is actually where people will start to see some benefit. Um and then maybe in edge cases um and that I expect much more research in Alzheimer's disease and other things to come.

Um then maybe you know higher doses will end up being better. I can't let you go without talking about sleep. sleep. sleep. Uhhuh. Uhhuh. Uhhuh. On some level we all know this already. It's like we need to be getting eight hours of sleep. We need to be practicing good sleep hygiene. Clearly, sleep is just absolutely foundational to brain health. Yeah. Um and I've had plenty of guests share, you know, the sort of detoxing process, the clearing out that occurs overnight. um what can you add to this or stress about the importance of of sleep with respect to ensuring your brain's health so that we don't like rehash uh old ground in terms of mechanisms like that I think the the main takeaway is that sleep is when um all the information all the skills all the things you've learned the new signaps you you generated which your brain is constantly generating the ones that are important they are cemented and refined during sleep that's kind of the um there's a synergistic effect between REM sleep and deep sleep that allows you know sinapses to be kind of perfected for one of a better word based on the previous day's input and integrated into everything we've experienced already.

There's also you know sleep is also really important for emotional processing and other things like REM sleep in particular. Um and then right you're washing out um uh amaloid and you know other things that accumulate during the day um during deep sleep but also just sleep in general through the lymphatic system. So, um, we know that people who don't sleep enough longterm have a have a higher risk of of dementia. The risk really seems to tick up in people who are chronically sleeping less than 6 hours a night.

Um, which is probably lower than most people might expect. M um in general I think you so like people say 8 hours but in reality depending like person to person and it changes over time the window is more like 7 to n maybe even 6 to 10 hours like based on like how much sleep people need. So like you're waking up the next day you're feeling refreshed you feel good you're probably getting enough sleep regardless of what it was. Um things to consider how we think about our sleep is also is also is also really important.

So people know you know the about the sleep routine like why sleep is important. Um the sort of like in addition to the sleep time uh sleep quality is critical. So usually when we think about poor sleep quality we know that's associated with increased risk of dementia. The way that we measure that is usually by asking people do you take something to help you sleep and those who take things to help them sleep tend to have a higher risk of dementia. That's probably because of a downstream effect of the things that they're taking.

So are you drinking alcohol to get to get to sleep? Are you taking um antihistamines like benadryil to get to sleep? Are you taking things like ambient uh to get to sleep? There is probably a combination of um issues that are causing insomnia in the first place that haven't been dealt with plus the the the effect of those medications themselves. Um if we consider alcohol self- medication that negatively impact our sleep and that's probably why contributing to long-term increased dementia risk. So alcohol creates a REM sleep deficiency in general.

Um if you're using alcohol to counteract all the caffeine that you drank during the day because you didn't sleep well the night before which is a very common sort of vicious cycle then uh caffeine can also impair deep sleep in particular. So if you're drinking still drinking caffeine in the afternoon then having a glass of wine to help you fall asleep right there sort of like a double whammy effect there. um ambience seems to negatively affect various aspects of neuroplasticity which um you can see this is mainly from animal studies um but uh then the antihistamines because they're anticolinergic and aylcoline which they sort of influence the function of is really important part of of long-term cognitive function those antihistamines that make you drowsy we know if you take those regularly that's associated with increased risk of dementia so thinking about are you using those things to go to sleep um if you require those things to go to sleep.

First of all, you're not necessarily asleep. You might just be unconscious. That's not the same. It's a faximile of sleep. Yeah. Exactly. Yeah. Exactly. Yeah. Exactly. It's resembling sleep. You know, any kind of like pharma intervention to produce sleep isn't actually producing sleep. sleep. sleep. And if it feels like sleep, it's still the sleep is not doing the job that sleep is supposed to be doing. There are some new drugs that are maybe changing that. Um but equally people people who have insomnia the the required architecture to get good quality sleep is still there.

It's just that the environment and the cognitive processes around sleep like they either don't feel safe or they're unable to wind down such that you can produce sleep. So that's where things like cognitive behavioral cognitive behavioral therapy for insomnia CBTI can become important. That's where the sleep environment can become important. Again we can become dependent on those medications. So you might need expert help to overcome that. But your sleep isn't broken. You just need to like retrain yourself up. The the final thing that's that I I think is is worth mentioning is that for many people, we've kind of swung too far in the other direction when it comes to sleep.

Um and the sort of like the hyperfocus on wearable data. Um, and this idea of orthosomnia where we become so focused on wearable and like our our sleep metrics become the target whereas the target should be that you get a restful night of sleep because it allows you to do all these other amazing things. It's the new garment like oh if I if it if it's not tracked I didn't actually sleep last night or I wake up and I don't know what to do with myself.

I mean I you know I have a Whoop. I love it. I definitely check it every morning, but I try to have an armslength uh relationship with how I let that data impact me. I still have to live my day and if it's all in the red, you know, like what is that doing to my mind in terms of how I'm appro problem solving and approaching those problems and making sure that I maintain a positive mindset? Would I be better off had I not known that I was in the red?

You know, like with from an Ellen Langanger perspective if I like I feel great, you know, and I think I have a healthy relationship with that. But I can see how that becomes problematic for people and it becomes, you know, like a neurosis. neurosis. neurosis. You you know, there was one classic Ellen Langanger study, she wasn't the the senior author. The senior author was um Steven Lachley because he's a cicadian biologist at Harvard. But they collaborated on a study where they had people come into the lab and they were randomized to sleep either for 5 hours or 8 hours but in classic Ellen Langa style they manipulated clock time.

Right? So they changed how long people thought they'd slept relative to how they actually slept. And what they found was that how long you thought you slept was a better predictor of how you felt the next and performed the next day than how you actually slept. So the example being people who slept for 5 hours but thought they had slept for for 8 hours didn't experience any impact on their function the next day. Uh and there are other studies that have used wearable data to manipulate this like hey you slept terribly last night even if they slept fine.

slept fine. slept fine. How fatigued they feel the next day is based on how well they they think they slept. Um this is important because wearables aren't great at actually detecting the quality of your sleep. um they can tell you how long you're asleep for pretty well, but telling you whether you're in like deep sleep versus REM sleep, they're really not that good at that. And this is like published data that that are out there. So, when they use those sleep stages to tell you something about your recovery score or your sleep score the next morning, you're using quite low quality data to tell you how you should feel that day.

So, the way that I've used this with professional athletes, um, and they're lucky because I work, you know, with their coaches who can sort of who sort of like oversee this stuff on a day-to-day basis, I would usually have the athlete, the athlete doesn't see the data, but the coach sees the data and they use that to look at trends over time, which are probably more accurate than like individual pieces of data. Um, so then we can integrate it and kind of change change change um, uh, kind of change things if if we need to.

if you can create right I think you create like a a cognitive distance from the data but like I think you can also create a temporal distance from the data because like you don't need to know how you slept last night in order to be able to perform today because you have to perform today regardless or you have to go about your day regardless review like a week later go back and review the past week yeah especially if you can then say oh yeah I didn't sleep that well that night but that was the night where I went to bed late or that was the night where I had an extra beer before bed or that was the night where I had a coffee in the afternoon right so you can still use those data to inform important things, but you're not allowing it to influence how you then, you know, perform on a on a daily basis.

Speaking of the relationship between the rest itself and your kind of mental relationship with the rest, uh this is something that is kind of an important issue in the world of Formula 1 and you've, you know, played a role in working with some of those athletes because they're just literally going across the world every week. I mean, the time zone shifts are insane. Yeah. So, what have you learned about working with those athletes and how have you counseledled them? counseledled them? counseledled them? Some things that I've learned, um, which were surprising to me at the time, but maybe shouldn't have been, is that the basics, particularly when it comes to rest and recovery, the basics still matter.

So, I've had um athletes come to me and say, "Oh, I'm looking at my wearable data. I'm worried I'm not getting enough REM sleep as a as a as an example. And I look through the data and it's very clear why they're spending 5 hours in bed. If you f spend 5 hours in bed, we know that most of your REM sleep happens at the end of the night. You're you're going to get less REM sleep. First of all, is that REM sleep number that accurate?

Hard to tell. Um but second of all, um like the the the most important thing for getting a good quality night of sleep is getting enough sleep opportunity, which just means spending enough time in bed ready to ready to sleep. And you see this again and again, like when there's issues with sleep, it's that athletes athletes aren't giving themselves the time and opportunity to get high quality rest. Of course, some of that comes from a travel schedule and things like that. So, you kind of have to take that into account.

Um, but when they are able to build those routines or maintain those routines or maintain the things that help support sleep at home whilst they're traveling, they can maintain a much better um quality of of sleep. something that we do. So the I do all my Formula One work through a company called Hints of Performance. Um and they, you know, so we work with the co with the coaches as as well. Um and the coach is sort of like inserted into the life of the driver.

They're doing the training program. They're doing the nutrition. They're like traveling with them the whole time. They're they hold the helmet, hold the umbrella, like they're they're there the whole time. We'll often do things like jet lag plans. So can we start to have them shift their circadian rhythm before before they travel? So, it's starting to manipulate caffeine and light and sleep time and food timing um a day or two before they travel um you know so that they're closer to the the target time uh when they get there.

And there are a number of apps that kind of allow you to to do that. Now, there's one called Faze that was developed by one of these F1 coaches uh because he was so used to having to do this on a daily basis, he's now kind of um created something that that people can use themselves. But then sort of like the bigger overarching thing um is that again ver you like the rest of us they struggle to just right they're getting plenty of stimulation right they have very complex jobs like driving the car uh they're getting lots of inputs doing that but then they also have um media commitments they have meetings with engineers they're constantly giving feedback on how the car drives right this is all very cognitively stimulating stuff so uh for them it's It's finding ways like I was saying you know earlier sort of like in that kind of you know age where you know they are mid20s 30s 40s where you're doing a lot of stuff with your brain it's how can you find time to kind of relax and downregulate yeah so it's all about so for them it's all about how can we give them space how can we give them time uh to improve and recover and that's the the message that I hear from them most frequently is like you know like how can I recover better how can I switch off how can I can I can I you know, just get some get some downtime because the demands on them are so so high.

So then there's all the stuff around sleep schedules, but then it's just finding things that allow them to to truly to truly switch off in a sort of a sustainable regular way. And you know, for some of them it's meditation or breath work practices, although most of the times when you say to a a 20-year-old, hey, you should meditate more. Like you just get a funny look. And um and then similarly the receptive athlete is the athlete at the in the sunset of their career who's looking to extend, you know, another year or two.

You know, then they're all about it. You know, the young ones, they're like, "No, no, no." and and young athletes in general can do a lot quote unquote wrong and still and still put put put I will say that the young generation of athletes is miles ahead of what the young athletes were like you know 20 30 years ago you know like they're they're very into like you know finding that extra edge with these very types of things things things absolutely and this is so we because we have a like well hint has this whole driver development pathway right so some of it is about instilling some of these things early on so then it's much easier to make those habits and sustain them once you're in sort of like the the F1 kind of world.

All right. So, I want you to imagine the the the I don't know 35 to 55 year old person who is listening to this or watching this and they're thinking I've been eating the standard American diet for 30 40 years. You know, yeah, my aunt or my what parent is experiencing dementia? I don't want that to happen to me, but you know, I'm kind of like cast my vote already. already. already. When is it too late? Is it too late? Give that person a reason to take what you're offering urgently.

The short answer is it's it's never too late. Um, and actually, this was one of the things I was going to say about sleep. There was an interesting study done by Matthew Walker where they looked at sleep trajectories in people across their lifetime and then looked at the burden of amaloid and towel proteins in their brain, you know, sort of like part of that um the process of of um uh uh dementia. Um and they found that people who'd improved their sleep later in life, so even if it was in their 50s or 60s or 70s, if your sleep improved, that was associated with a lower burden of later amaloid in the brain.

All that saying cuz people ask, well, I spent all this time, I was young, I had kids, I was busy, I didn't sleep that well. Is it like did I already do this damage? Is it undoable? And like on a sleep perspective, at least from that study, it kind of suggests no, it's not. And we see that then across all of these different um areas. So there are now multiple studies where um you know the the best evidence probably comes from multi- um like multi-intervention um kind of approaches.

So um the the most famous one is finger was run in Finland. It was just repeated here in the US was uh that study was called pointer. Um lots of other studies have um around the world have done something essentially similar. But what they do is they address cardiovascular risk. They have people start a new exercise training program with some resistance and aerobic exercise. They have them uh improve their improve their diet quality. And then you know there's there's some other some other pieces. Sometimes there's like a a stress reduction component.

Um but like just starting to attend to some of these basics and this is either in people at high risk of dementia or starting to experience some decline already. And actually you see bigger benefits you tend to see bigger benefits in people who've maybe you know starting to see some decline. Not that they've gotten a diagnosis of dementia but you know maybe they're already below the below kind of the average in terms of cognitive function. And you can see this within sort of like six to six to 12 months of just starting to attend some of these basics.

once you're already in your 60s and 70s. So if you start even earlier, right, you start in your 30s, 40s, 50s, you potentially have 20 years to change this trajectory. Another example might be when you look at cognitive changes that happen during um permenopause, the menopausal transition in women, which is in that kind of towards the you know mid to latter part of that that uh time window that you mentioned. we see that greater cognitive changes um tend to be experienced in those who have some element of say metabolic disease.

Um so the what the Swan study in in the US showed that. Um so again we know that um changing your diet, changing your physical activity, um addressing cardiovascular risk factors then affect um your uh the severity of metabolic syndrome and related components that you can you can improve blood pressure, you can improve blood sugar and you know doing that at that time period could potentially like completely change that that trajectory. So all of that to say like wherever you are in that window um even if you're beyond that 55 years old there's still scope to change that trajectory trajectory trajectory that is incredibly empowering and and speaks to the unbelievable resilience of the human being.

Yeah. Like it's it is kind of amazing. But reflecting on how we kind of opened this podcast with this notion that 45 and you say up to 70% of dementia cases are preventable and here we are talking about you know people who are kind of tiptoeing into that and there's still the opportunity to halt it reverse some of the symptomology or like stave off you know this this this you know kind of terrible future. Why isn't this something that everyone is shouting from the mountain tops?

Like so many people are suffering from this just absolute horrible affliction that is devastating to families. Like I feel like this is a message that needs to get out there and should be being repeated constantly. You know, you can avoid this. this. this. Here's the way to do this. Why is this the conversation that we're not having all the time? I'll I'll like before I get into that I'll quickly say that that 70% number wasn't something that I made up. That was another analysis that was done by professor Jayu using UK bio bank data.

So a big data set of more than half a million people in the UK they estimated the upper end of of dementias that may be preventable is is over 70%. So again just like a similar way you do a big statistical analysis and that's the kind of number that comes out. So like regardless of where the truth is in that in that range um whatever it ends up being right there that's still a huge number of dementias that are potentially preventable. Of course we're talking at the population level right we can't and we're talking about statistics and probabilities.

I'm not saying that you could definitely pre prevent any individual person from from getting dementia but we know we can dramatically decrease our risk. So I'm I'm really hopeful that the conversation is changing like over the last two or three years in particular like especially um a lot of people struggled uh with their brains after COVID either due to you know long COVID or the effects of you know lockdown and everything how that changed you know the the sort of like our lifestyle and on our environment and since you know the since the last sort of two or three years people have been talking about brain health more and more and more and so I see it out there, you know, they're mentioning uh Jill Livingston's work and they're mentioning some of these analyses and they're saying that, you know, it's not too late, you know, things like the pointer trial that was just published last year.

So, I agree that we're not saying it enough. Um, and I agree that we should be hopeful if we're able to engage at this on a personal level and then ideally make changes at a societal level as well. Um, but I think that tide is changing. So, I hope that um you know, you and I speak in a year or two and you can be like, "Oh, yeah, you're right." You know, people are talking about this more and more and people are realizing they have so much more agency here.

Um and so I hope it's going that direction and it certainly seems like people are starting to go that way. That's very exciting. Yeah. Yeah. Yeah. So maybe to conclude uh the conversation, it would be good if you could, you know, even like look right to camera is like what do you want people to know? like there somebody's listening to this. I've never heard anything like this before. Oh my goodness. You know, I now am going to take greater uh agency over these decisions that I'm going to make.

I certainly don't want to have this kind of thing happen to me. How do I begin and how can you kind of leave them with an empowering message about how to embark upon this journey? Sure. So, the thing that I want everybody to know is that we each have a huge amount of control over our long-term cog uh cognitive trajectory and we can dramatically decrease our risk of dementia even if we have uh a family history of dementia or you know um no people with dementia.

And the best way to start to do this is just to find one thing that you know you can start to move the needle on that feels um uh doable to you. And so it could be slight changes to your diet. It could be um adding a new aspect to your exercise routine. Uh it could be going to your doctor and getting your blood pressure checked and treating it if you need to. Um think about uh the risk factors for other people that you know or in your family who had dementia that you might share with them.

That's always a great place to start, too. And know that because because because all the different um factors that affect brain health interact with one another, when you start to change one thing, the whole network will start to shift in your favor. your favor. your favor. Amen. I love it. Uh to the audience, uh I want to say we covered a lot of ground today. Uh and it may feel like, hey, we didn't drill down enough on this, that, or the other thing. Well, the good news is uh you can find all the particulars in Tommy's new book, The Stimulated Mind, out now.

Again, I'll say what I said at the outset, like this is a real public service, and your work is vital. Um, brain health obviously impacts all of us. Very few people are untouched by the diseases of cognitive decline. And so I urgently uh uh impress upon everybody who's watching and listening to pick up the book and um take your brain health more seriously. So thank you for your time today. Thanks so much for having me and I hope everybody found this useful. Peace. Peace. Peace. Cool.