Adding a few more steps to your daily routine can really help keep your brain healthy as you age. A 14-year study in Scientific Reports found that people who walked more each day did much better on tests for focus and self-control. Even 1,000 extra steps a day made a noticeable difference.
Keeping our minds sharp is becoming a big public health issue. In the U.S., cases of mild cognitive impairment are expected to rise from 14.37 million in 2025 to 21.55 million by 2060. Dementia cases could almost double too, going from 7.16 million to 13.85 million.
Earlier studies linked exercise to better brain health and high blood pressure to mental decline, but there was a problem: most studies just asked people how much they exercised, and people often misjudge their own habits.
To get real data instead of guesses, researchers tracked 3,093 adults aged 18 to 93 in the national All of Us Research Program. From 2009 to 2023, participants wore Fitbits to count their daily steps, and doctors recorded their systolic and diastolic blood pressure from medical records.
After 14 years, everyone took four computer tests that measured focus, ability to ignore distractions, planning skills, and how well they could read emotions on faces.
Researchers sorted the participants into three groups based on their activity levels. The least active group walked about 5,100 steps a day. The middle group averaged 8,900 steps, and the most active walked around 14,200 steps daily. Both the middle and most active groups did much better than the least active group when it came to self-control and focus.
Surprisingly, blood pressure had little effect on the mental test scores. The lower blood pressure numbers did not change any of the four test results, and higher top numbers only lowered scores on one decision-making test.
Lower blood pressure explained just 4.8% of the connection between walking and self-control. This suggests that exercise helps the brain in other ways, such as reducing inflammation or helping brain cells use blood sugar.