Brain HealthJust 3,000 Daily Steps May Slow Tau Buildup and Cognitive Decline in Early Alzheimer's
Walking may slow Alzheimer's-related brain changes, and the bar is lower than the famous 10,000-step goal. Researchers followed almost 300 older adults with early brain signs of Alzheimer's for nine to 11 years, tracking daily steps with pedometers. Physical activity did not reduce amyloid plaques, the target of most current drugs. Instead, in people who already had plaques, more activity was linked to slower buildup of misfolded tau protein in specific brain regions. Tau is more closely tied to memory loss and functional decline. More active participants showed nearly half the decline. Benefits appeared at about 3,000 steps, roughly half an hour of moderate walking, and peaked at 5,000 to 7,500 steps before leveling off. The study was small, observational, and drawn from mostly white, well-educated US participants, so it cannot prove walking is the cause. Still, it fits with larger studies tying daily steps to lower dementia risk, and it offers a realistic target for older, sedentary adults.
