Walking a little, every day: a simple habit that counts
Good news for anyone who thinks you have to be athletic to protect your brain: a study published in Nature Medicine, widely shared again this October 2026, shows that modest activity is already enough to make a difference.
The study
Researchers at Mass General Brigham (Boston) followed 294 people aged 50 to 90, with no memory problems at the start, as part of the Harvard Aging Brain Study. Their steps were measured with a pedometer, and their brains were followed with imaging and yearly cognitive tests for up to 14 years.
What they found
- Among people who already showed early signs of the disease, the most active had slower build-up of tau protein and slower cognitive decline.
- The benefit appears from 3,000 to 5,000 steps a day, roughly half an hour of easy walking.
- It peaks between 5,000 and 7,500 steps a day, then levels off: no need to aim for 10,000 steps.
- According to the researchers, decline was delayed by about 3 years on average for people walking 3,000 to 5,000 steps, and by about 7 years at 5,000 to 7,500 steps, compared with the least active.
A word of caution
This is an observational study: it shows an association, not proof of cause and effect. The group was small and fairly homogeneous. But the message is encouraging: every step counts, and it is never too late to start.
Day to day, at home
At SUR.lu, we encourage the people we support to stay active at their own pace: a walk around the block, a few laps of the garden, taking the stairs with a safe handhold. Our teams can help you find suitable, safe habits, together with your doctor.
Sources
- Yau W.-Y. W. et al., Physical activity as a modifiable risk factor in preclinical Alzheimer's disease, Nature Medicine, 2025 — doi.org/10.1038/s41591-025-03955-6
- Just 3,000 Steps a Day May Help Slow Alzheimer's, ScienceDaily, 19 octobre 2026 — sciencedaily.com