Does exercise keep my brain sharp?
Regular exercise demonstrably keeps your brain sharper, as long as serious cognitive decline has not yet set in. The best-supported approach: 45 to 60 minutes of moderate exertion per session, several times a week.
Yes, exercise keeps your brain sharper -- and that holds true at every age. An analysis of 133 systematic reviews involving more than 258,000 participants and 2,724 randomised trials shows consistent small to moderate improvements in memory, planning, focus and general cognition1. Even light exertion is enough to produce an effect.
For people over 50 the picture is equally positive. A meta-analysis of 36 randomised trials found a comparable moderate improvement in cognitive functioning2. Aerobic training, strength training, tai chi -- all of them worked. Sessions of 45 to 60 minutes at at least moderate intensity delivered the greatest gains. Older adults benefit relatively the most; in children and adolescents it is mainly memory and planning skills that improve most strongly3,1.
Which type of training is best depends on your goal. Aerobic training scores highest for general cognition. Strength training helps most with planning and focus. Mind-body exercises such as tai chi or yoga contribute most to memory3. Combining strength training with a simultaneous mental task appeared to help slightly more in older adults with cognitive complaints, but that evidence is still limited by small participant numbers4.
In Parkinson's disease there are also early encouraging signs. In a randomised trial of 130 people, six months of home cycling led to better brain connectivity, less brain shrinkage and better cognitive control, compared with a stretching group5. Exercise may therefore also be able to slow decline in a serious brain disease.
That said, exercise is not a miracle cure. A large, well-designed trial of 585 older adults with memory complaints but not yet dementia found that 18 months of intensive exercise -- 300 minutes per week -- did not improve memory significantly more than in the control group6. And in advanced dementia, a trial of 91 patients found no cognitive benefit after 24 weeks of walking and strength training either7. The effect therefore varies by person, age and how far any existing decline has already progressed.
Based on one large umbrella analysis (PMID 40049759, 133 systematic reviews, ~258,000 participants), multiple meta-analyses of randomised trials (PMID 28438770, 37924980) and individual randomised trials (PMID 34951063, 36511926, 32192537, 38658827). Two well-designed trials (PMID 36511926 and 32192537) show no significant effect in specific subgroups -- an important caveat to the otherwise predominantly positive picture.
Is it bad for your brain if you don't get enough exercise for years on end?
Years of too little exercise is associated with a clearly elevated risk of memory problems and dementia. Moving more, even lightly, is the most concrete form of protection you can build in.
What can I do to keep my brain healthy as I age?
Combining more exercise with staying mentally active and eating a diet low in sugar and higher in omega-3 fatty acids currently gives you the best chance of a healthy brain. Spermidine and new insights into how the brain cleans itself are, for now, only interesting to follow.
What keeps your memory sharp in later life?
Getting good sleep, eating mindfully according to the MIND diet and engaging in targeted cognitive training have the strongest support for protecting your memory in later life. Some factors, such as the UV-skin link, are still too preliminary to act on.
Does learning a new language help keep your brain healthy?
Actively using two languages throughout your life is associated with a lower risk of dementia and a brain that continues to function well for longer, but learning a language as an adult does not yet provide comparable protection. If you want the benefits, it comes down to years of active use, not learning alone.
Does your brain age faster than the rest of your body?
Whether your brain ages faster than the rest of your body varies from person to person, but the consequences are significant: a biologically old brain increases the risk of Alzheimer's more than threefold. Keep an eye on your blood pressure, sleep and lifestyle, as these have the most demonstrable influence on brain ageing.
Is reading every day good for your brain in the long run?
Daily reading is probably good for your brain, but the evidence is largely observational; a firm causal relationship in healthy people is still lacking, so reading is a sensible habit, not a proven treatment.