Physical exercise and dementia prevention: the WHO's strongest recommendation

I'm 58 and my mother had Alzheimer's. I know I should move more — but does physical exercise really make a difference to dementia risk, or is it just another generic piece of advice?

It really does make a difference — and it's no coincidence that we're starting here. In the World Health Organization's guidelines on reducing the risk of dementia (2nd edition), physical activity for adults with normal cognition is the recommendation with the strongest classification in the entire document. For those with a family history who want to do something concrete, this is the best first step.

What the WHO says exactly

For adults without memory complaints, physical activity should be recommended to reduce the risk of cognitive decline — a strong recommendation, with moderate certainty of evidence. For those already diagnosed with mild cognitive impairment, the recommendation remains, although with more limited evidence. In both cases, the meaning is the same: what is good for the heart and blood vessels is good for the brain.

How much and what

The WHO's general guidelines for physical activity apply here: regular aerobic movement (brisk walking, swimming, cycling), muscle strengthening exercises, and less time spent sitting throughout the day. You don't need a gym or marathons — consistent daily walks already count. The best exercise is the one you can maintain for years.

It's never too late to start

Evidence suggests that the risk of dementia accumulates throughout life — meaning that every stage counts, including the one you are living now. Starting at 58 is not "late": it is precisely in middle age that several risk factors weigh more heavily. If you have chronic diseases or doubts about what is safe for you, talk to your doctor before increasing intensity.

One step at a time

If you don't do anything today, start with 20 to 30 minutes of walking on most days. When that becomes a habit, add more. And remember: exercise protects more when accompanied by other habits — also see the combined approach, which the WHO highlights as especially promising.