A U.S. research team found target mileage that might "potentially [offer] a more approachable goal" than the classically touted 10,000 steps.
If 10,000 steps a day is out of reach in your routine, brain scientists share good news: A much shorter daily walk could also help you make meaningful strides toward protecting your brain. A November 2025 study published by neurology researchers in the journal Nature Medicine reports that walking as few as 3,000 steps per day, which clocks in around a mile and a half, may help delay the onset of Alzheimer’s-related symptoms by several years.
The research, part of the Harvard Aging Brain Study, followed 296 cognitively healthy older adults for up to 14 years. Participants wore step counters and underwent yearly cognitive assessments, as well as brain scans that tracked two Alzheimer’s-linked proteins: amyloid-β and tau. These proteins are key markers of the disease, with tau forming the tangles that disrupt brain function in Alzheimer’s cases, the Cleveland Clinic explains.
The researchers ultimately found that even modest movement was associated with slower buildup of tau and less functional decline over time. Participants who averaged between 3,000 and 5,000 steps a day experienced a roughly three-year delay in cognitive decline, while those reaching 5,000 to 7,500 steps saw a delay of about seven years, compared to their less active peers. (A rough calculation is that between 2,000 to 2,500 steps equals a mile for most adults.)
Beyond that moderate level of exercise, reductions in tau accumulation and cognitive decline plateaued, “potentially offering a more approachable goal for older sedentary individuals,” the researchers conclude.
Lead author Wai-Ying Wendy Yau, MD, a cognitive neurologist at Mass General Brigham, noted that the findings show a strong link between exercise and cognitive health—not direct proof of cause and effect. However, the researchers theorize that exercise may protect the brain by improving blood flow, reducing inflammation, and supporting the release of beneficial hormones.
“Every step you take in the right direction helps with brain health,” Dr. Yau recently told The Washington Post.
The study did have some limitations, that publication notes. For instance, step counts were only recorded for a week, and the pedometers didn’t distinguish between walking, running, and other types of physical activity. Additionally, the participants were predominantly well-educated and white, which may narrow how broadly the results apply. Still, the data adds to growing evidence that regular movement supports brain health.
Considering that nearly half of Alzheimer’s cases worldwide may be tied to preventable factors such as inactivity, according to the study, the importance is clear. A daily 30-minute stroll, or just moving more throughout your day, could help your mind stay sharper for longer. “Exercise is a hard habit to build, but I like to tell my patients every little bit helps,” Dr. Yau commented.
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