Exercise and Brain Health: Walking 3,000–5,000 Steps a Day May Help

A nine-year Mass General Brigham study of nearly 300 adults aged 50–90 found walking 3,000–5,000 steps daily was associated with about a three-year delay in cognitive decline and 5,000–7,500 steps with about a seven-year delay; Dr. Gary Small noted benefits leveled off beyond 7,500 steps.

Researchers and experts are emphasizing walking as a simple form of physical activity linked to brain health. A study from Mass General Brigham followed nearly 300 adults aged 50 to 90 for nine years, tracking daily step counts and using brain scans and annual cognitive tests. Dr. Gary Small of Hackensack Meridian Health described a moderate step range as especially relevant. He also noted mood and inflammation benefits tied to regular exercise. Study and expert notes: - Nearly 300 healthy participants aged 50–90 were followed over nine years with daily step counts recorded and annual cognitive assessments. - Scans measured amyloid‑beta and tau, proteins associated with Alzheimer’s disease, alongside the cognitive testing. - Walking 3,000–5,000 steps per day was associated with an average three‑year delay in cognitive decline; 5,000–7,500 steps per day was associated with about a seven‑year delay, according to the published study. - Dr. Gary Small described 3,000–5,000 steps as a “sweet spot” linked to less abnormal tau and less cognitive decline, and said benefits increased up to 7,500 steps but showed no added gain beyond that. - Dr. Small also noted exercise can raise endorphins (affecting mood), may increase brain volume, and can help reduce inflammation, factors discussed in the coverage. Summary: The study links modest daily walking with measurable differences in cognitive decline timing and highlights accompanying mood and biological changes reported by experts. Undetermined at this time.