Brain Health
Memory, focus, and staying mentally sharp over decades.
Chris Hemsworth said“I carry a high-risk Alzheimer's gene, so I lean on exercise, sleep, and stress control to fight back.”
The science saysSupported. Big studies link regular exercise to meaningfully lower dementia risk, though they cannot promise it for any one person.
Verdict: He can't out-run his genes, but he can make them sweat.
David Sinclair said“Taking resveratrol every day helps slow down human aging.”
The science saysNot established in people. Resveratrol extended life in mice on a rich diet, but human trials and a failed drug program never showed the benefit.
Verdict: Spectacular in a mouse, unproven in a professor.
Bryan Johnson said“A strict protocol of food, sleep, exercise, and more than one hundred daily supplements can measurably slow how fast you age.”
The science saysNot established. The basics help, but slowing human aging with a large supplement stack is unproven, and a routine of one person cannot prove it works for anyone else.
Verdict: Measure all you want. The anti-aging headline is running ahead of the evidence.
Wim Hof said“My breathing and cold method lets you consciously control your immune system.”
The science saysGenuinely mixed. One real randomized trial showed his method can blunt a lab-induced immune response, but it was 24 healthy young men, not proof of everyday immunity.
Verdict: A real PNAS paper, skated way past what twenty-four guys can carry.
Andrew Huberman said“Get sunlight in your eyes first thing and it sets your whole day and night.”
The science saysLargely supported. Light is the master cue for the body clock and morning light shifts it earlier, though the lab studies used brighter, longer light than a quick glance outside.
Verdict: Real clock-setting biology, dosed more precisely than the studies.
Jack Dorsey said“Eating one meal a day and fasting all weekend makes me sharper.”
The science saysMostly unsupported. The closest trial of one-meal-a-day eating found higher blood pressure and worse blood sugar, and the focus boost is untested.
Verdict: One meal a day sharpened his focus and nudged his blood sugar the wrong way.
Goldie Hawn said“Hawn says a daily meditation practice physically thickens the brain's cortex and keeps her mind strong with age.”
The science saysBrain-imaging studies link long-term meditation to differences in cortical structure, but the data are largely correlational and the effect is modest.
Verdict: The cortex claim has real studies behind it, but it is association, not a proven cause-and-effect.
Sanjay Gupta said“Gupta argues that physical activity, even something as simple as walking, is the single most effective thing you can do to protect your brain as you age.”
The science saysLarge prospective cohorts and meta-analyses consistently link higher physical activity to lower rates of cognitive decline and dementia.
Verdict: The walking-for-your-brain link is real and well replicated, but it is association, not proof that walking alone prevents dementia.
Clint Eastwood said“Eastwood credits decades of twice-daily Transcendental Meditation as a tool that helps him manage stress.”
The science saysSmall randomized trials and meta-analyses suggest modest reductions in blood pressure and stress, but the studies are small, often run by TM-affiliated researchers, and results conflict.
Verdict: Meditation is safe and may take the edge off stress and blood pressure, but the longevity case for TM specifically is thin and contested.
Arianna Huffington said“Huffington argues that sleep is the foundation of health and performance, and that thriving has to begin with it.”
The science saysLarge meta-analyses link both short and long habitual sleep to higher all-cause mortality, supporting sleep as a core health behavior.
Verdict: On this one the evangelist is right: chronically short sleep is a real, measurable risk, not a hustle perk.
LL Cool J said“LL Cool J says regular resistance training is an investment that builds physical strength and also sharpens the mind and decision-making.”
The science saysLarge cohort studies find that regular muscle-strengthening activity is associated with meaningfully lower all-cause, cardiovascular, and cancer mortality.
Verdict: Lifting really is equity in your body: the mortality data backs the metaphor.
Sting said“Sting says a near-daily morning yoga practice gives him more energy, a calmer mind, and the fitness to keep performing into his 70s.”
The science saysModerate: randomized trials show yoga improves balance, mobility, and vitality in older adults, but nothing about it has been shown to extend lifespan.
Verdict: The flexibility and balance gains are real and well-measured; the fountain-of-youth part is his, not the data's.
Jerry Seinfeld said“Seinfeld says practicing Transcendental Meditation twice a day, paired with weight training, gives him reliable energy and focus and could improve almost anyone's life.”
The science saysMeditation programs show small-to-moderate benefits for stress, anxiety and blood pressure, but nothing supports the sweeping claim that it can solve anyone's life.
Verdict: A genuine, modestly proven way to calm the system, not a fix for everything.
Jordan Peterson said“Peterson says switching to an all-beef carnivore diet drove dramatic weight loss, better sleep and the lifting of his depression and other symptoms.”
The science saysThese are uncontrolled personal reports; no trials show an all-beef diet treats depression or extends life, and the broader evidence on heavy red-meat intake points the other way.
Verdict: A striking personal anecdote, not evidence that all-meat eating is healthy or therapeutic.
Gisele Bündchen said“Bündchen says she stays fit and clear-headed by doing exercise she enjoys outdoors, such as horseback riding, biking and skiing.”
The science saysStrong and consistent: regular physical activity of almost any kind lowers all-cause and cardiovascular mortality and also supports mood and cognition.
Verdict: Choose the movement you will actually keep doing: the data rewards the habit, not the venue.
Kaley Cuoco said“Cuoco says doing hot yoga five times a week transformed her body and does everything for her, mentally and physically.”
The science saysYoga is well supported for flexibility, balance, back pain and stress, but it is not an established stand-alone tool for reshaping body composition.
Verdict: Great for a supple, calmer body: not a proven physique-remodeler on its own.
Dakota Johnson said“Johnson says sleep is her single highest priority and she needs 10 to 14 hours a night to feel functional.”
The science saysProtecting sleep is strongly tied to better health, but routinely needing 10 or more hours is not 'better'; both very short and very long sleep track with higher mortality.
Verdict: Prioritizing sleep is smart; treating 14 hours as the goal is not where the evidence points.
Ringo Starr said“Starr credits eating broccoli with every meal and blueberries every morning with keeping him young and active.”
The science saysVegetable- and berry-rich diets track with better heart and brain health, but no single food keeps a person young.
Verdict: Good food, oversold benefit: the diet is genuinely healthy, but broccoli and blueberries are not a fountain of youth.
Miley Cyrus said“Cyrus says she left veganism and reintroduced fish and omega-3s because a plant-only diet had left her brain not functioning properly.”
The science saysWeak and overstated: there is little evidence that a few fish meals quickly sharpen a healthy young brain, though plant-based eaters do need a reliable EPA/DHA source.
Verdict: The omega gap is real, but fish is the fix she reached for, not the fix the evidence requires.
Julianne Moore said“Moore says simple daily habits, hydration, yoga and movement that improves blood flow, limiting sugar and alcohol, and challenging herself intellectually, support her long-term brain health.”
The science saysReasonably supported in direction: exercise that boosts blood flow is one of the better bets for protecting aging cognition, though the softer habits she names are far less proven and no single habit guarantees anything.
Verdict: The blood-flow instinct is sound; the rest is sensible living dressed up as brain hacks.
Michael J. Fox said“Fox says optimism, which he roots in gratitude, is what lets him keep going while living with Parkinson's.”
The science saysLarge prospective cohorts and a meta-analysis link higher optimism to lower all-cause mortality and fewer cardiovascular events, though the data are observational.
Verdict: The mindset he describes tracks with better survival odds in the data, even if no study can prove it bought him years.
Bill Gates said“Gates says he abandoned his old belief that sleep was laziness and now treats seven hours a night as a requirement for creative thinking and long-term brain health.”
The science saysLarge pooled cohort data consistently link habitually short sleep with higher mortality and dementia risk, so the general direction of Gates's position is well supported, though the seven-hour figure is a population average and not a personal threshold.
Verdict: The habit is sound; the precise number is a population average wearing a personal disguise.
Simone Biles said“Biles says ongoing talk therapy has been meaningfully relieving for her mental health, including while travelling and competing.”
The science saysStructured psychotherapy has strong randomized-trial evidence for treating depression and anxiety, though almost none of that research was done in elite athletes.
Verdict: Well-supported treatment, studied in patients rather than podium finishers.
Mike Tyson said“Tyson credits his vegan diet with giving him more stamina and a more positive state of mind.”
The science saysWell-planned plant-based diets can improve some heart and metabolic markers, but there is no solid evidence they boost stamina or mood the way he describes.
Verdict: Good for cholesterol, unproven for the 'tremendous' stamina and mindset boost Tyson describes.
Orlando Bloom said“Bloom says he starts his day with green powders mixed with brain octane oil, a collagen powder for his hair and nails, and protein.”
The science saysCollagen peptides have some trial support for skin, but there is little rigorous evidence that green powders or MCT oil improve hair, nails, brain function, or energy.
Verdict: A tidy, expensive stack that outruns its evidence: mostly harmless, mostly unproven for what it promises.
Aaron Rodgers said“Rodgers says four nights alone in complete darkness is worthwhile because it forces a sustained silence and self-reflection that ordinary life never allows.”
The science saysThere is essentially no controlled research on multi-day darkness retreats, and the nearest evidence, on meditation retreats and sensory restriction, is short-term, modest, and not a match for what he describes.
Verdict: Silence has a small evidence base, four days of blackout has none, and the DMT explanation is pharmacology folklore.
Deepak Chopra said“Chopra points to research suggesting intensive meditation raises telomerase activity, an enzyme tied to cellular aging.”
The science saysA meta-analysis does find a small association between mindfulness meditation and higher telomerase activity, but the studies are few and small, and no evidence shows this translates into slower aging or longer life.
Verdict: A real signal on a surrogate marker, stretched further than the data reaches.
Shohei Ohtani said“Ohtani says sleep ranks ahead of everything else in his routine, aiming for roughly 10 hours at night plus a long nap before games.”
The science saysPrioritising sleep is one of the better-supported recovery habits in sport, though the specific 10-hour target is his own and not something the mortality data recommends to everyone.
Verdict: One of the few celebrity habits where the direction of travel is right even if the number on the clock is personal.
Stephen Curry said“Curry says that as he has aged, sleep quantity, consistency, and good sleep habits matter more than any other part of his recovery.”
The science saysSleep duration and regularity are among the best supported recovery levers there are, and controlled sleep-extension work in basketball players specifically shows performance gains.
Verdict: The least glamorous item in his routine is the one with the strongest paper trail.
Tom Holland said“Holland says alcohol was wrecking his sleep, and that since he stopped drinking he sleeps easily anywhere.”
The science saysControlled studies agree that alcohol fragments the second half of the night and suppresses REM, so removing it plausibly improves sleep quality, though the tracking-ring evidence he cites is personal rather than clinical.
Verdict: The mechanism is real even if the ring is not the proof.
Alan Alda said“Alda says doing a lot of specific exercise can hold back the progression of Parkinson's disease.”
The science saysStructured exercise reliably improves motor symptoms, balance and quality of life in Parkinson's disease, but evidence that it slows the underlying disease is still weak.
Verdict: Right about moving, ahead of the evidence on stopping the clock.
Dana White said“White says he was told by experts that water fasting can significantly reduce the risk of cancer, Alzheimer's and other health problems.”
The science saysThere is no human outcome evidence that multi-day water fasting reduces cancer or Alzheimer's risk; the disease-prevention findings come mainly from animal studies.
Verdict: A real fast attached to a claim no human trial has tested.
Dave Asprey said“Asprey says blending butter and MCT oil into coffee delivers steady energy and focus without the mid-morning crash of ordinary coffee.”
The science saysNo trial has tested butter coffee itself; the MCT component has weak, small-trial signals for cognition, while the saturated fat side of the drink runs against a clear meta-analysis showing tropical oils raise LDL cholesterol.
Verdict: A real breakfast habit with a marketing claim attached to it that the studies never tested.
Ashton Kutcher said“Kutcher adopted Steve Jobs's fruit-only diet to prepare for the role and says it put him in hospital in severe pain two days before filming began.”
The science saysFruit-only eating is one of the few dietary patterns with documented cases of serious harm, and there are no trials showing any longevity benefit.
Verdict: The fruit is fine. The word only is what does the damage.
Rita Moreno said“Moreno says that with high-impact dancing behind her, she now trains balance directly, standing on a balance ball beside a wall so she can catch herself.”
The science saysDeliberate balance and stepping practice is one of the few interventions with repeated randomized evidence for reducing falls in older adults.
Verdict: The habit is well matched to the evidence, and the wall is doing as much work as the ball.
Megan Thee Stallion said“She says she took up regular exercise as a way to redirect her energy after a traumatic period, and that training is what lifts her mood.”
The science saysStructured exercise produces real, measurable reductions in depressive and anxiety symptoms in randomized trials, so the mood effect she describes is one of the better-supported claims in this whole category.
Verdict: A rare case where the celebrity habit and the trial evidence point the same direction.
Matthew Walker said“He argues that no major organ or brain process escapes the damage of insufficient sleep, and that widespread sleep loss is one of the century's largest public health problems.”
The science saysShort sleep is robustly and repeatedly associated with higher mortality and cardiovascular risk in large cohorts, but the relationship is U-shaped rather than linear, and the evidence is observational rather than causal.
Verdict: The direction is right and the certainty is oversold.
Elon Musk said“Musk says he sleeps about six hours a night and that cutting below that lowers his total productivity rather than raising it.”
The science saysThe half of his statement about going below six hours is well supported, but the same research finds six hours is itself a restriction that quietly degrades performance and tracks with higher long-term risk.
Verdict: Correct that less than six is worse, and mistaken that six is where the cost stops.
Mel Brooks said“Brooks credits his long life to still making comedy, saying the work keeps him sane and happy and gives him a reason to be alive.”
The science saysA sense of purpose is one of the better-supported psychosocial predictors of longer survival, though the laughter half of his answer rests on much thinner and less consistent data.
Verdict: The reason to get up in the morning has better evidence behind it than the punchline does.
Ray Kurzweil said“Kurzweil says he takes roughly 80 supplement pills daily, along with injections, as part of staying healthy long enough to benefit from future medicine.”
The science saysLarge randomised trials and the US Preventive Services Task Force find no all-cause mortality, cardiovascular or cancer benefit from routine vitamin, mineral and antioxidant supplementation in healthy adults.
Verdict: This is the most tested question in supplements, and the answer keeps coming back the same way.
Norman Lear said“Lear said that laughter, and staying fully present between what is over and what is next, is what added years to his life.”
The science saysCohort studies consistently link a strong sense of purpose, optimism and humour to lower mortality, but they are observational and cannot establish that laughing more causes a longer life.
Verdict: The direction of his claim matches the data, but the causal arrow is still pointing both ways.
Maria Shriver said“Shriver argues that keeping up friendships and social connection is a genuine brain-health habit, alongside exercise, sleep and diet.”
The science saysLarge prospective cohorts consistently link loneliness and thin social contact to higher dementia risk, though no trial has yet shown that adding friendships lowers it.
Verdict: The direction is right and the certainty is borrowed: strong cohort signal, no trial behind it.
Susan Sarandon said“Sarandon says that staying engaged, staying curious and enjoying yourself is a large part of ageing well.”
The science saysPurpose, engagement and social connection are consistently linked to lower mortality and lower dementia risk in large cohorts, but the evidence is observational and cannot show that adopting an attitude causes the benefit.
Verdict: A soft-sounding answer with a surprisingly hard evidence base, and a stubborn causal asterisk.
Steve Aoki said“Aoki says he uses a hyperbaric oxygen chamber daily when he is home as part of an attempt to lengthen his life.”
The science saysHyperbaric oxygen has proven uses in a short list of medical conditions, but the human data on healthy ageing is a handful of small studies with surrogate endpoints and no evidence that it lengthens life.
Verdict: Real technology, real medical uses, and a lifespan claim the studies never actually tested.
Kyrie Irving said“Irving says switching to a mostly plant-based diet improved his energy, sleep and mental sharpness, which he attributes partly to avoiding GMOs and pesticides.”
The science saysPlant-forward diets are consistently linked to better cardiovascular outcomes, but the energy, sleep and cognition benefits he describes are not established, and the GMO explanation is not supported.
Verdict: Good diet, plausible feelings, wrong explanation.
Dean Ornish said“An intensive program of plant-based diet, exercise, stress management and group support can slow, and in some people improve, cognition in early Alzheimer's disease.”
The science saysOne small randomized trial found modest cognitive benefit, and it sits alongside larger multidomain prevention trials whose results have been inconsistent.
Verdict: Promising and genuinely randomized, but 51 people over 20 weeks is a starting line, not a finish.
Julia Louis-Dreyfus said“She says she wants to keep working on ambitious projects and keep making new friends as she gets older, treating that engagement and her health as part of the same package.”
The science saysLarge prospective cohorts consistently link strong social ties and a sense of purpose to lower all-cause mortality, though the studies are observational and cannot prove the direction of cause.
Verdict: The instinct is well supported by cohort data, even if nobody has ever randomised anyone into having friends.