After 60, the brain changes in ways you can feel and ways you cannot. Memory gets a little slower, names take longer to come, and sleep gets lighter. No habit can guarantee you will never develop dementia, and no single food or supplement can prevent it. What the best research does show is that a handful of everyday habits, done together over years, are linked to a lower risk — and the sooner you start, the more they add up.
1. Move Every Day, Even From a Chair
Movement is the strongest habit on this list, and it does not need to be hard. Working muscles release compounds called myokines, which scientists are studying as one way exercise may support the brain. The CDC recommends 150 minutes of physical activity a week for adults — about 20 minutes a day — and the Alzheimer's Association lists "get moving" among its healthy brain habits. One large analysis of 69 studies found adults who met that 150-minute target had about 25% lower dementia risk than inactive adults. It is never too late to start, even if you need to exercise from a chair, and short, consistent movement counts more than one heroic workout a week.
2. Eat for Your Brain — Fish, Not Pills
DHA, an omega-3 fat found in seafood, sits at the centre of brain food, along with sardines, shellfish, seaweed, mushrooms, curry and fermented cheeses. Eating fish as part of a healthy dietary pattern is linked to better thinking in observational studies, and that pattern — plenty of vegetables, whole grains and lean protein, less processed food — is what the Alzheimer's Association recommends. But DHA pills are a different story: a large NIH study of about 4,000 older adults followed for five years found omega-3 supplements did not slow cognitive decline, and the World Health Organization now recommends against taking omega-3, vitamin B or E, or multivitamins specifically to ward off dementia, unless you have a diagnosed deficiency. Enjoy the fish; skip the promise on the bottle.
3. Give Your Brain an Overnight Fast — and Real Sleep
This habit has two parts: avoid food for several hours before bed, delay breakfast to stretch the overnight fast, and protect deep sleep. Fasting is sometimes linked to ketones and to the repair of the tiny energy factories in your cells, and to the brain's overnight waste-clearance system. That chain is a theory, not a proven dementia treatment — no major guideline recommends fasting to prevent dementia, and the evidence is mostly from animal studies and small, short human pilots. What is well supported is the sleep half: the National Institute on Aging suggests seven to eight hours of sleep a night, and too little sleep is linked to higher dementia risk. If you take diabetes medicine, insulin, or medicines that must be taken with food, talk to your doctor before changing when you eat.
4. Stay Connected — Loneliness Is a Risk Factor
Loneliness is easy to overlook, and it matters more than most people think. Social isolation is one of the 14 modifiable risk factors counted by the 2024 Lancet Commission, which estimates that about 45% of dementia cases worldwide could potentially be prevented or delayed by addressing all 14 factors together — a population figure, not a personal promise. Large analyses link loneliness to roughly 30% higher dementia risk, and social isolation to about 28% higher risk. In long-lived communities, people gather, share meals and spend time together. You do not need a crowd: one regular phone call, one shared meal, one club or class can be the habit.
5. Challenge Your Brain With Something New
The last habit is to learn actively, not just repeat what you already know. Crossword puzzles, memory games, and learning a new language later in life are all good examples of active learning. The Alzheimer's Association lists "challenge your mind" among its brain habits, and one trial in people with mild cognitive impairment found crosswords improved thinking and showed less brain shrinkage over 78 weeks than computer brain games. Actively retrieving information — recalling a word, a name, a new phrase — is likely more valuable than passively repeating a familiar puzzle, though no trial proves that learning a language prevents dementia in healthy adults.
What the Evidence Can't Tell Us
No study can prove that these five habits, together, will prevent dementia in you. The 45% figure is for all 14 risk factors combined, under ideal conditions, across a whole population. The DHA, fasting and "superfood" claims go beyond the evidence, and the strongest support is for the simplest habits: moving, sleeping well, staying connected and staying mentally active. The U.S. POINTER trial, which tested a structured programme of exercise, a healthy diet, mental and social activity and health monitoring in 2,111 adults aged 60 to 79, found the structured group improved slightly more than a self-guided group over two years — real, but modest.
How to Do It — Start With One Habit
1. Pick just one habit from the five and make it your first step.
2. Move for 20 minutes a day — walk, march in place, or do a seated routine.
3. Put fish or seafood on the menu twice a week, as part of a vegetable-rich meal.
4. Set a regular bedtime and aim for seven to eight hours of sleep.
5. Call, visit or eat with someone you care about at least once a week.
6. Spend 15 minutes a day on something new — a language, a puzzle, a skill.
7. Keep it sustainable for two weeks, then add the next habit.
A Few Precautions
Do not stop a prescribed sleep medicine suddenly — talk to your doctor first, especially about benzodiazepines and sleeping pills, which older adults are advised to avoid as a first choice. Do not fast if you have low body weight, diabetes on insulin or other medicine, or medicines that must be taken with food, without medical advice. Do not buy DHA or other "brain" supplements expecting them to prevent dementia. This article is general information, not medical advice.
The Bottom Line
Five small habits — move, eat a healthy pattern, sleep well, stay connected and keep learning — will not guarantee a sharp memory for life, but together they are the best-supported way to lower your dementia risk after 60. Start with one, make it easy enough to keep, and build from there. Small habits, repeated daily, are the whole idea.
Sources and Further Reading
1. CDC — Prevention of Alzheimer's Disease and Dementia. https://www.cdc.gov/alzheimers-dementia/prevention/index.html
2. Alzheimer's Association — 10 Healthy Habits for Your Brain. https://www.alz.org/help-support/brain_health/10-healthy-habits-for-your-brain
3. National Institute on Aging — Can I Prevent Dementia? https://www.nia.nih.gov/health/what-is-dementia
4. World Health Organization — Guidelines on risk reduction of cognitive decline and dementia, 2nd edition (2026). https://www.who.int/publications/i/item/9789240123557
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