Here is the question I get more than almost any other now, and the fear underneath it is real: what is the one thing I can do to prevent dementia?
I understand why we ask it that way. We want a lever. One supplement, one food, one test, one prescription. Something we can buy or swallow or check off. And the wellness industry is more than happy to sell it to us.
I have to tell you the truth, because this is what I’d want said to me: there is no one thing. There is no single food, supplement, or hack that prevents dementia. Nothing is FDA-approved to prevent it, and anyone promising you a shortcut is selling something.
But that is not the bad news it sounds like. It’s actually the most hopeful thing I know about brain aging. Because the thing that does work is not exotic, not expensive, and largely in your hands. The hack is the stack.
For years, the strongest evidence for protecting the aging brain was observational: large groups of people followed over time, with researchers noticing that those who moved more, ate better, stayed engaged, and kept their blood pressure in check tended to develop dementia less often. Useful, but limited, because observation can’t prove cause. People already sliding toward dementia, years before any diagnosis, tend to move less and withdraw socially. So some of what looked like “activity protects the brain” was the disease quietly suppressing activity. This is the trap, and it’s why I’m careful with the word “prevent.”
Then the trials came. In 2015, the Finnish FINGER study became the first large, well-run randomized trial to test a combination of healthy habits against cognitive decline, and it worked: the group that got the multidomain program held onto their thinking skills better.
And in 2025, the largest study of its kind in the United States reported out. US POINTER, published in JAMA, enrolled 2,111 older adults at risk for decline and ran for two years. It tested four habits together: structured exercise, the MIND diet, regular cognitive and social engagement, and monitoring of blood pressure and other vascular numbers. Both versions of the program improved people’s memory and thinking, and the more structured, accountable version improved them more. The benefit held across sex, across race and ethnicity, and even in women carrying APOE-e4, the higher-risk Alzheimer’s gene.
Two honest notes, because you deserve the real version. These trials measured cognition, meaning performance on thinking and memory tests, not dementia diagnoses. And trial effects tend to be more modest than the eye-popping numbers from observational studies. Both things can be true: the observational signals are large, the trial proof is real but smaller, and together they point the same direction.
Move, especially strength. Regular physical activity is associated with roughly 20% lower dementia risk in observational data, though this is exactly the number most distorted by that reverse-causation problem, so I hold it loosely. What I don’t hold loosely: movement protects the muscle, the metabolism, and the blood vessels your brain depends on. Strength training is where I’d start, and it happens to be the most defensible thing you can do for the rest of your body too.
Eat the MIND way. This is the specific eating pattern the trials used. Leafy greens and berries most days, plus nuts, beans, whole grains, olive oil, and fish, with less red meat, butter, fried food, and sweets. You do not need it perfect. You need the direction.
Protect your blood vessels. What is good for your heart is good for your brain. Better cardiovascular health is associated with about 39% lower dementia risk, and in women, risk climbs about 8% for every 20-point rise in the top blood-pressure number. One nuance that matters: this link is cleanest when your cardiovascular health is good in midlife, not only late in life. Which is precisely why your 40s and 50s are not too early. They may be the most important window you have.
Stay mentally challenged and socially connected. Of all the single factors studied in women, midlife mental activity is one of the clearest, tracking with about 46% lower Alzheimer’s risk and 34% lower total dementia risk. Learning, problem-solving, staying curious. And connection is not a soft add-on: isolation is a genuine risk factor, and other people are part of the treatment.
Here is the number that ties it together. In one large study, women who practiced four to five of these healthy habits together had up to 56% lower Alzheimer’s dementia risk than women practicing none or one.
Read that honestly: it’s a relative risk from an observational study, not a personal guarantee, and it can’t prove cause. But the pattern is consistent everywhere we look. One habit helps a little. Stacked, they compound. That is the whole point, and it’s also why no one can bottle it and sell it to you. You build it.
If the stack is where your energy should go, here is where it shouldn’t. No supplement has been shown to prevent dementia, full stop. The “brain support” and “memory” bottles lining the pharmacy shelf are mostly marketing built on the exact one-thing wish I described at the top. The same goes for most commercial brain-training apps: the evidence that they make you better at anything beyond that specific game, let alone protect you from dementia, is thin. And be wary of direct-to-consumer scans and panels sold as brain-health screening without a clinician guiding why.
I’m not telling you this to be a killjoy. I’m telling you because the money and the hope poured into those shortcuts are money and hope pulled away from the four things that actually have evidence behind them. Spend it on the stack.
The mistake is trying to do all four at once, perfectly, on a Monday. Don’t. Pick one category, take the first rung, and let it become automatic before you reach for the next. Here is how I’d build each one.
Move, especially strength
Start tonight: a 10 to 20 minute walk after one meal a day.
Then add two short strength sessions a week using your own body weight. Sit-to-stands from a chair, wall push-ups, and carrying the groceries on purpose.
Build toward resistance training two to three times a week with real, progressing load; roughly 150 minutes of activity a week; and a little balance work.
Eat the MIND way
Start tonight: put leafy greens on one meal and a handful of berries somewhere in your day.
Then add cooking with olive oil, working in nuts and beans, and aiming for fish once or twice a week.
Build toward it: most meals follow the pattern, and you’ve quietly cut back red meat, butter, fried food, and sweets. Direction, not perfection.
Protect your blood vessels
Start tonight: find out your blood pressure. A home cuff or the pharmacy machine counts.
Then add: track it over a couple of weeks, and bring the numbers to your clinician if the top number is running high.
Build toward: blood pressure, blood sugar, and cholesterol all managed to target with your clinician’s help.
Stay mentally challenged and socially connected
Start tonight: do one thing that’s genuinely a little hard (a language app, a real puzzle, or an instrument) and text one person back into your week.
Then add a recurring class or group that gives you learning and the people in the same place.
Build toward a steady rhythm of challenge and connection: a club, volunteering, and standing plans you don’t cancel.
Notice what’s happening as you climb: you’re not chasing one magic habit; you’re stacking. That’s the whole game.
Nearly two-thirds of people living with Alzheimer’s are women. That alone makes brain health a women’s health issue, not a someday issue. And almost everything above points to the same timing: the earlier you start stacking, the more the evidence is in your favor. Not at 75. Now.
You do not have to do all four perfectly. You do not have to do them all this week. The most powerful move is also the simplest: pick one, and start tonight. A walk after dinner. Greens on the plate. The blood pressure check you’ve been putting off. A call to a friend instead of another scroll.
The hack was never going to be a pill. The hack is the stack.
This is education, not medical advice, and it isn’t a substitute for care that accounts for your history. Talk with your own clinician about your personal risk, especially your blood pressure, blood sugar, and any medications.
If this was useful, the kindest thing you can do is forward it to one woman in your life who’s been scared to ask the question. And tell me in the comments: which one are you starting with?
The randomized trials (the strongest evidence that the stack works):
Baker LD, et al. Structured vs Self-Guided Multidomain Lifestyle Interventions for Global Cognitive Function: The US POINTER Randomized Clinical Trial. JAMA. 2025. https://jamanetwork.com/journals/jama/fullarticle/2837046
Ngandu T, et al. A 2 year multidomain intervention of diet, exercise, cognitive training, and vascular risk monitoring versus control to prevent cognitive decline in at-risk elderly people (FINGER): a randomised controlled trial. The Lancet. 2015. https://pubmed.ncbi.nlm.nih.gov/25771249/
The observational evidence (large associations, cannot prove cause):
Dhana K, et al. Healthy lifestyle and life expectancy with and without Alzheimer’s dementia. The BMJ. 2022. (women with 4-5 vs 0-1 healthy factors: 56% lower Alzheimer’s risk, HR 0.44) https://doi.org/10.1136/bmj-2021-068390
Najar J, et al. Cognitive and physical activity and dementia. Neurology. 2019. (midlife cognitive activity in women: 46% lower Alzheimer’s risk, 34% lower total dementia) https://doi.org/10.1212/wnl.0000000000007021
Li X, et al. Cardiovascular health, measured using Life’s Essential 8, is associated with reduced dementia risk among older men and women. J Am Geriatr Soc. 2024. (about 39% lower dementia risk, HR 0.61) https://doi.org/10.1111/jgs.19194
Gong J, et al. Sex differences in the association between major cardiovascular risk factors in midlife and dementia. BMC Medicine. 2021. (women: ~8% higher dementia risk per 20 mmHg higher systolic blood pressure) https://doi.org/10.1186/s12916-021-01980-z
Iso-Markku P, et al. Physical activity as a protective factor for dementia and Alzheimer’s disease. Br J Sports Med. 2022. (~20% lower dementia risk, RR 0.80) https://doi.org/10.1136/bjsports-2021-104981
The honest caveats (reverse causation, and trial effects smaller than observational):
Kivimäki M, et al. Physical inactivity, cardiometabolic disease, and risk of dementia: an individual-participant meta-analysis. The BMJ. 2019. (activity association weakened after addressing reverse causation) https://doi.org/10.1136/bmj.l1495
Meng X, et al. Multidomain lifestyle interventions for cognition and the risk of dementia: a systematic review and meta-analysis. Int J Nurs Stud. 2022. https://doi.org/10.1016/j.ijnurstu.2022.104236
Castro C, et al. Multi-Domain Interventions for Dementia Prevention: A Systematic Review. J Nutr Health Aging. 2023. https://doi.org/10.1007/s12603-023-2046-2
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