How to Future-Proof Your Brain from Dementia — Dr. Tommy Wood
45-70% of dementia is preventable through lifestyle changes. The brain depends on adequate energy metabolism, and maintaining mitochondrial function through proper nutrition (DHA, B vitamins, creatine), managing blood sugar, preventing inflammation, and early physical activity are critical for brain
1h 55mKey Takeaway
45-70% of dementia is preventable through lifestyle changes. The brain depends on adequate energy metabolism, and maintaining mitochondrial function through proper nutrition (DHA, B vitamins, creatine), managing blood sugar, preventing inflammation, and early physical activity are critical for brain health. After a brain injury, avoid fever and blood sugar spikes, supplement with creatine and omega-3s, consider exogenous ketones, and return to low-level aerobic exercise as soon as tolerable.
Episode Overview
Dr. Tommy Wood discusses brain health across the lifespan, from infant brain development and injury recovery to dementia prevention in aging adults. He explains why human babies are born with significant fat stores (to support rapid brain development through ketones and DHA), what to do after a concussion, and the modifiable lifestyle factors that can prevent 45-70% of dementia cases. Key themes include the critical roles of DHA, B vitamins, mitochondrial function, blood sugar management, physical activity, and the interaction between omega-3 status and methylation in cognitive health.
Key Insights
Human babies are uniquely fat to support brain development
Humans are the only mammalian species born with significant body fat. This fat serves as a repository for DHA (critical for brain structure) and as a source of ketones, which are the brain's preferred fuel for synthesizing fats and cholesterol during rapid early development.
Fever management is critical after brain injury
While hypothermia trials for adult TBI haven't shown benefit, preventing hyperthermia (fever) is crucial. Fever increases the gap between metabolic demand and energy supply in an already-damaged brain, worsening outcomes. Use acetaminophen and antibiotics to prevent fever.
Blood sugar control matters acutely after head trauma
High glucose spikes are stressful during acute brain injury, both as a cause and effect. Avoid refined carbohydrates immediately after concussion. This doesn't mean avoiding all carbs, but minimizing large glucose excursions helps reduce secondary injury.
DHA requires adequate methylation to work in the brain
Trials giving only omega-3s or only B vitamins for dementia prevention failed. Both are required: DHA must be attached to phospholipid head groups (derived from choline) to sit in cell membranes, a process requiring methylation. High homocysteine (indicating poor methylation) prevents omega-3s from being effective.
Early return to physical activity accelerates concussion recovery
Low-level aerobic exercise as soon as tolerable (without worsening symptoms) is one of the most evidence-based interventions for brain injury recovery. Mechanisms likely include improved cerebral blood flow, myokine release, and better sleep quality.
Caffeine protects premature infant brains but should be avoided after adult TBI
Caffeine given to premature babies (for apnea) shows durable cognitive benefits into childhood. However, after adult brain injury, avoid caffeine early on—it increases brain metabolic rate when mitochondria are already damaged, similar to the problematic effect of fever.
45-70% of dementia is preventable through lifestyle factors
The Lancet Commission estimates 45% of dementia is preventable by addressing modifiable risk factors: smoking, low education, hearing loss, hypertension, obesity, physical inactivity, diabetes, social isolation, depression, air pollution, and excessive alcohol. Other studies suggest up to 72% may be preventable.
Alzheimer's index patient probably didn't have Alzheimer's
Auguste Deter, the first person diagnosed with what became Alzheimer's disease, likely had neurosyphilis, nutrient deficiencies, or psychiatric conditions. She had no genetic risk factors. This highlights how what we now call 'Alzheimer's' is actually quite different from what Alois Alzheimer originally studied.
Notable Quotes
"We are the only species that's born fat, even compared to other primates. And it's thought that the primary reason for this is that that fat is a repository for things that the brain needs in order to develop."
"45 to 70% of dementia is preventable through lifestyle. 45% comes from the most recent edition of the Lancet Commission report on dementia prevention looking at different risk factors that have a consistent relationship with dementia risk."
"The most important thing to do is to prevent fevers. If you increase that gap because the you know higher metabolic rate because you're hotter, that seems to make that injury worse."
"The home environment is where the biggest impact happens. Even if you have an imperfect start to life, there's probably a lot that you can do as a parent to help that brain to develop and grow as normally as possible."
"Both are required in order to see benefit. Omega-3s only saw benefit in individuals who had a low enough homocysteine. It's thought to be because if you want DHA to be in a membrane in a cell in your brain it needs to be attached to some kind of phospholipid and that requires methylation."
Action Items
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1
Get comprehensive blood testing including omega-3 index and homocysteine
Track omega-3 status and homocysteine levels over time. Both must be optimized for brain health: aim for 1-2g DHA daily (2-3 servings of fatty fish weekly or supplement) and keep homocysteine below 13 through B vitamin intake (particularly B6, B12, folate).
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2
Prepare a brain injury protocol
Keep exogenous ketones, creatine, high-quality fish oil, B vitamins (especially riboflavin), and branch chain amino acids on hand. After any head injury: prevent fever with acetaminophen, avoid refined carbs and caffeine, supplement with creatine and omega-3s, and return to low-level aerobic activity as soon as tolerable without worsening symptoms.
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3
Address modifiable dementia risk factors systematically
Focus on: regular physical activity (including late in life), hearing protection/correction, blood pressure management, maintaining healthy weight, continuing education/cognitive engagement, social connection, quality sleep, avoiding excessive alcohol and smoking. Even small improvements compound over decades.
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4
Prioritize DHA for parents and expecting mothers
If pregnant, nursing, or have young children, ensure adequate DHA intake (fatty fish, quality supplements). The mother will sacrifice her own stores for the baby, and adequate DHA supports critical early brain development. Consider 1-2g daily during pregnancy/nursing.