Diary of a CEO on Hormones: 8 Episodes, Ranked

Diary of a CEO on hormones: the 8 strongest episodes in our summary library, ranked and summarized. Insulin with Benjamin Bikman, testosterone with Rena Malik, women's hormones and HRT with Rachel Rubin, plus cortisol, visceral fat, and sleep timing. Free to read in full.

Diary of a CEO has built one of the deepest hormone catalogues in podcasting, and these eight episodes are the ones worth your listening hours. The short answer for most searchers: start with Dr Rachel Rubin on women's testosterone and hormone therapy, then Dr Benjamin Bikman on insulin, then Dr Rena Malik on male testosterone and blood flow. Those three cover the hormones people actually come looking for.

Scope, stated plainly: we summarized every Diary of a CEO episode in our library, weighted toward the past year of the show, then filtered for conversations where hormones carry the episode and ranked the strongest eight. This is a slice of a much larger back catalogue, so read it as the best recent hormone coverage in our library.

Each entry explains why the episode earns its rank, the specific claims worth acting on, and one quote from the conversation. Every episode links to our full free summary, and the official YouTube upload is embedded wherever we could verify it. Three cross-episode arguments run underneath the list, including one place where these guests openly disagree, and we take those apart after the rankings.

1. Dr Rachel Rubin: Testosterone, Estrogen, and the Gaps in Women's Hormone Care

Diary of a CEO · Steven Bartlett with Dr Rachel Rubin · 1h 47m

Rubin is a urologist who specializes in women's sexual medicine, and she delivers the single most useful correction on this list: female testosterone starts falling in the thirties, a decade or more before menopause enters the conversation. She maps the full menstrual-cycle hormone pattern, explains what the pill does to testosterone, and revisits the 2000s hormone-therapy study whose misreading cost a generation of women their treatment options. If you searched for hormones because something shifted in your thirties, this is the episode.

Key takeaways

  • Female testosterone begins dropping in the thirties, showing up as low libido, slower arousal, and delayed orgasm well before menopause.
  • Birth control pills shut down ovulation and supply synthetic estrogen and progestin while leaving testosterone unreplaced, with up to 27% of users reporting low libido or painful sex.
  • Across the cycle: estrogen rises through the first half to ovulation, progesterone leads the second half, and testosterone peaks around ovulation when conception is most likely.
  • Female testosterone therapy is typically dosed at roughly one tenth the male dose, and the same researchers behind the 2000s hormone-therapy scare have since published findings showing no added cardiovascular risk below age 70.
We fundamentally don't give a crap about women's sexual health, about their menstrual cycles, pregnancy, menopause, hormones, pain with sex, libido. But we actually do have a lot of information that we are not using because everyone forgot to teach your doctor. — Dr Rachel Rubin

Read the full episode summary

2. Dr Benjamin Bikman: Insulin Is the Hormone That Decides Whether You Store Fat

Diary of a CEO · Steven Bartlett with Dr Benjamin Bikman · 2h 1m

Bikman makes the strongest single-hormone argument in the whole catalogue: insulin, far more than calorie totals, governs what your cells do with energy. He backs it with the type 1 diabetes case (strip out insulin and fat gain becomes impossible even at tens of thousands of calories a day) and with identical-calorie meals producing opposite metabolic outcomes. This is the episode that reframes fat loss as an endocrine problem with a dietary lever.

Key takeaways

  • Insulin instructs every cell on what to do with energy; when it stays elevated it forces storage and slows metabolic rate, which blunts calorie restriction.
  • Two meals with identical calories behave differently: the low-carb, high-fat version raises metabolic rate for hours while the high-carb version suppresses it.
  • In a low-insulin state the liver makes ketones, which Bikman calls the brain's preferred fuel and credits for clearer focus and steadier mood.
  • Fat tissue metabolic rate roughly triples in ketosis, and ketones are partly breathed out and excreted, creating a deficit that arrives without hunger.
Insulin is the one metabolic hormone to rule them all. It will tell every single cell of the body what it needs to do with energy. — Dr. Benjamin Bikman

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3. Dr Rena Malik: A Urology Expert on Testosterone, Blood Flow, and Sexual Function

Diary of a CEO · Steven Bartlett with Dr Rena Malik · 1h 59m

Malik is the most-watched urologist on the internet and the most practical voice here on the parts of testosterone you can actually move. Her four pillars (fuel, strength, environment, connection) arrive with numbers attached: 150 minutes of weekly cardio matching Viagra for erectile function, heavy lower-body resistance work lifting testosterone, and five-hour nights cutting it 15%. The episode treats erectile function as a cardiovascular readout you can change on purpose.

Key takeaways

  • 150 minutes of moderate weekly cardio improved erectile function about as much as Viagra, and a light walking protocol improved it 70% in men with heart disease.
  • Men who hold muscle mass through heavy glute and lower-body resistance training are three times less likely to develop erectile dysfunction, and that training also raises testosterone.
  • Mediterranean eating carried a 22% lower erectile dysfunction risk, with 100g of daily pistachios and blueberries showing measurable effects and fiber targets of 38g for men, 25g for women.
  • Five-hour sleep nights drop testosterone 15%, and arousal requires a parasympathetic state that constant phone stimulation blocks.
Guys who sleep 5 hours a night, their testosterone drops by 15%. — Dr. Rena Malik

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4. Dr Annette Bosworth: Insulin, Meal Timing, and the Earliest Signs of Brain Decline

Diary of a CEO · Steven Bartlett with Dr Annette Bosworth · 1h 51m

Bosworth supplies the variable Bikman leaves implicit: when you eat. Her claim that one bite after 6pm costs what ten bites before noon do is the most memorable timing heuristic in the show's health catalogue, and she pairs it with a physical-exam checklist (armpit skin tags, dark velvety neck skin, hair loss on the toes) that lets you spot chronically high insulin years ahead of a diabetes diagnosis.

Key takeaways

  • Eating after 6pm keeps insulin working through eight or more overnight hours, which suppresses fat burning and ketone production while you sleep.
  • Visible markers of chronically high insulin include armpit skin tags, dark velvety skin on the neck and elbows, hair loss on the toes and legs, and abdominal weight gain.
  • Morning cortisol releases stored glucose, so late eaters can wake with high blood sugar after a full night of fasting.
  • Ketone production requires low insulin, which is why her 12-step ketogenic continuum removes insulin spikes before anything else.
If you eat that food, one bite of food after 6:00 is worth 10 bites of food before noon. — Dr. Annette Bosworth

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5. Dr David Unwin: Reversing Insulin Resistance in Real Patients

Diary of a CEO · Steven Bartlett with Dr David Unwin · 2h 11m

Unwin is the clinical evidence the other insulin episodes need. Across 13 years in a UK general practice he documented 93% remission in pre-diabetes and 73% in early type 2 diabetes using carbohydrate reduction, and he opens by describing the patient who told him off for 25 years of advice that failed her. His teaspoon-of-sugar equivalents are the most transferable teaching tool on this page.

Key takeaways

  • The liver fills with fat for roughly a decade before a type 2 diagnosis, which is why intervening at pre-diabetes reaches 93% remission and drops to 50% after five years of diabetes.
  • Glycemic load predicts blood sugar impact better than glycemic index alone: cornflakes carry 8 teaspoons of sugar equivalent, boiled white rice 8.5, a medium potato 7, a banana 6.
  • Insulin converts surplus glucose into fat stored first around the belly and then inside the liver, and that liver fat then worsens insulin resistance in a self-feeding loop.
  • Patients who cut carbohydrates saw liver function improve 30-50%, blood pressure normalize without medication, sleep need fall by about an hour, and chronic hunger fade within weeks.
For every year that you have poorly controlled type 2 diabetes, you're losing 100 days of life. That's about a third of a year. — Dr. David Unwin

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6. Dr Rhonda Patrick: Visceral Fat, Sleep Loss, and Insulin Resistance

Diary of a CEO · Steven Bartlett with Dr Rhonda Patrick · 2h 39m

Patrick supplies the mechanism connecting sleep, insulin, and body composition, and her numbers are the ones that stick: two weeks at four hours a night added 11% visceral fat with zero movement on the scale. She also separates exercise modalities cleanly, arguing aerobic work is what clears visceral fat while resistance training earns its keep elsewhere. This is the episode for anyone lean on the outside and metabolically struggling underneath.

Key takeaways

  • Visceral fat is metabolically active, secretes inflammatory molecules, doubles early mortality risk, and raises metastatic cancer risk 44%, and lean people can carry dangerous amounts of it.
  • Two weeks of four-hour nights raised visceral fat 11% in healthy young men with no weight change, through sympathetic activation and insulin resistance.
  • Five days of 1,200 to 1,500 surplus calories from ultra-processed food produced visceral fat gain, fatty liver signs, and brain insulin resistance in young men.
  • Aerobic exercise is the modality that clears visceral fat first, and it makes muscle glucose-responsive without insulin, which reverses insulin resistance.
  • After 10-12 hours of fasting the liver depletes glycogen and produces ketones, which raise GABA and sharpen cognition.
You can actually be lean but have a high amount of visceral fat. We call these metabolically unhealthy people. — Dr. Rhonda Patrick

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7. Dr Michael Breus: Chronotypes, Sleep Timing, and Your Daily Hormone Curve

Diary of a CEO · Steven Bartlett with Dr Michael Breus · 2h 24m

Breus is the practical scheduler of this group. His chronotype framework (lion, bear, wolf, dolphin) is really a hormone-timing framework: melatonin, cortisol, adrenaline, and dopamine release on a genetic schedule, so the same activity pays different returns at different hours. The 90-minute caffeine delay and his case for morning sex both fall straight out of that curve, and he attributes roughly 75% of sleep complaints to anxiety and fear.

Key takeaways

  • Your chronotype sets when your brain releases melatonin, cortisol, adrenaline, and dopamine, which turns it into a scheduling tool for deep work, exercise, and sex.
  • Wait 90 minutes after waking for your first caffeine: cortisol and adrenaline are already high, and 15-20 ounces of water first addresses the liter you lose overnight through breathing.
  • Most couples have sex between 10:30pm and 11:30pm when melatonin is high and sex hormones are low; the morning matches the hormone profile that supports it.
  • The nap-a-latte (fast black coffee, then a 25-minute nap) clears adenosine while caffeine blocks its return, buying roughly four hours of energy.
  • Melatonin production slows from around age 45-50 and sleep fragments with more EEG arousals, so quality degrades even when total hours hold.
When you have a brain that's full of adrenaline and cortisol and you add caffeine to it, it's like adding weak tea to somebody who's taking cocaine. — Dr. Michael Breus

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8. Dr Martin Picard: Mitochondria, Cortisol, and the Cost of Chronic Stress

Diary of a CEO · Steven Bartlett with Dr Martin Picard · 2h 38m

Picard puts a price tag on cortisol. His Columbia lab measured stress hormones raising energy expenditure by 16%, which turns rumination into a measurable metabolic cost drawn from the same fixed budget that funds repair and growth. He also reframes excess glucose as voltage forced through a system with too little demand, which is the cleanest bridge between the insulin episodes above and ordinary daily fatigue.

Key takeaways

  • Stress hormones raised energy expenditure 16% in Picard's experiments, so worry and rumination draw down the same budget that funds staying young and healthy.
  • Energy runs on a fixed budget: pushing more fuel in without physical activity to carry it raises resistance, which surfaces as overheating and inflammation.
  • High blood glucose and diabetes raise cancer risk by forcing surplus energy onto cells, and cancer cells abandon efficient mitochondrial respiration for the Warburg effect.
  • Movement converts energy into work and lowers resistance, which is why physical activity changes how alive you feel more reliably than eating more does.
We did an experiment because we wanted to know how much energy does it cost to worry about the future, to ruminate about yesterday. And we found that the stress hormone increased energy expenditure by 16%. — Dr. Martin Picard

Read the full episode summary

What these episodes have in common

Theme 1: Insulin is the hormone four of these guests keep circling back to

Half this list converges on insulin from four different professional angles. Benjamin Bikman argues the biochemistry: insulin decides what every cell does with energy, and identical calories produce opposite outcomes depending on macronutrient composition. Annette Bosworth adds the clock, claiming a bite after 6pm carries ten times the metabolic cost of a bite before noon because it holds insulin elevated through the night. David Unwin brings 13 years of patient data from a UK practice, with 93% remission in pre-diabetes. Rhonda Patrick closes the loop from the other end, showing that four-hour sleep nights create insulin resistance and 11% more visceral fat inside two weeks.

Put together, they describe one condition with four entry points: what you eat, when you eat it, how much you move, and how well you sleep. Unwin's numbers are the ones that carry the most weight, because they come from an ordinary general practice rather than a laboratory, and his 93% to 73% to 50% remission gradient gives the argument something the mechanism talks lack: a cost for waiting.

Theme 2: Sleep and timing act as hormone interventions, and everyone here treats them that way

Michael Breus builds his whole framework on hormone timing: melatonin, cortisol, adrenaline, and dopamine release on a genetic schedule, so identical behavior pays different returns at 7am and 10pm. That claim gets independent support from three other guests. Rena Malik reports that five-hour sleep nights cut testosterone 15%. Rhonda Patrick measured 11% visceral fat gain from two weeks of short sleep with no change in body weight. Annette Bosworth explains the morning-cortisol mechanism that leaves late eaters waking with high blood sugar after a full night of fasting.

The actionable version is narrow and cheap. Protect sleep duration first, since it moves testosterone and visceral fat directly. Stop eating several hours before bed so insulin can fall overnight. Delay caffeine 90 minutes so it lands as cortisol is dropping. Every one of those is a hormone intervention, and none requires a prescription, a lab panel, or a supplement order.

Theme 3: Where these guests openly disagree, and how to read the conflict

The strongest disagreement on this list is dietary. Bikman and Bosworth build their protocols around carbohydrate restriction and ketone production, treating dietary fat as the safe default. Malik's erectile-function data points the opposite direction: a Mediterranean pattern, which is comparatively carbohydrate-rich, carried a 22% lower risk, with pistachios, blueberries, and 38g of daily fiber doing specific work. Unwin sits between them, reducing carbohydrates without pushing patients into sustained ketosis. Patrick reframes the question entirely around energy balance and aerobic exercise, arguing that resistance training alone leaves visceral fat where it is.

Read the conflict by outcome. The low-carbohydrate camp is optimizing for insulin and fat loss, and its evidence is strongest there. Malik is optimizing for vascular function and blood flow, where fiber and polyphenols carry the data. Patrick is optimizing for visceral fat and cognition, where aerobic volume and sleep matter most. The overlap all four accept is the practical starting point: cut refined carbohydrates and ultra-processed food, eat enough protein, move aerobically most days, and sleep seven hours or more.

One caution worth carrying into every episode here. These are podcast conversations, and the guests are advocates for their own frameworks, with claims relayed as they were said on air. Picard's 16% stress-hormone finding and Unwin's remission rates come from published work; several of the dietary superlatives are the guest's own interpretation. Treat the list as a map of the arguments and take specifics about your own hormones to a clinician who can run the panel.

Every episode referenced

Frequently Asked Questions

What are the best Diary of a CEO episodes about hormones?

Start with Dr Rachel Rubin on women's testosterone, estrogen, and hormone therapy, then Dr Benjamin Bikman on insulin as the master metabolic hormone, then Dr Rena Malik on testosterone and blood flow in men. Those three cover the hormones most listeners are searching for. From there, Dr Annette Bosworth handles insulin timing and Dr David Unwin brings 13 years of clinical remission data.

Which Diary of a CEO episode covers women's hormones and hormone replacement therapy?

Dr Rachel Rubin's episode is the one. She covers estrogen, progesterone, and testosterone across the menstrual cycle, explains why female testosterone starts falling in the thirties well before menopause, and revisits the 2000s hormone-therapy study whose misinterpretation kept treatment away from women for two decades. She also notes that the original researchers have since published findings showing no added cardiovascular risk below age 70.

What does Diary of a CEO say about raising testosterone?

Dr Rena Malik gives the most concrete protocol: 150 minutes of moderate weekly cardio improved erectile function about as much as Viagra, heavy resistance training of the glutes and lower body raises testosterone, and five-hour sleep nights cut it by 15%. Dr Rachel Rubin covers the female side, where testosterone therapy runs at roughly one tenth the male dose and treats low libido, arousal, and orgasm difficulty.

Does Diary of a CEO cover hormones and fertility?

Fertility comes up inside the hormone episodes more than as a standalone subject in our library. Dr Rachel Rubin walks through the full menstrual-cycle hormone pattern, including why testosterone peaks around ovulation when conception is most likely, and explains how birth control pills suppress ovulation. Dr Rena Malik covers male sexual function and the lifestyle inputs behind it. For anything beyond that, browse the full library by topic.

Where can I read these Diary of a CEO hormone episodes in summary form?

Every episode on this page links to a complete free breakdown on our site: the key takeaway, the guest's main insights, and the quotes that carried the conversation, with the official YouTube upload embedded where we verified it. Reading one takes about three minutes against a two-hour listen, and the browse page opens the rest of the library by show and topic.

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