• Both too little and too much exercise can accelerate brain aging. The study found a U-shaped relationship where people who were sedentary and those who exercised excessively both showed signs of older-looking brains compared to moderate exercisers.
• Moderate physical activity appears optimal for brain health. People who engaged in moderate amounts of light, moderate, or vigorous exercise had the youngest-looking brains, regardless of the specific intensity level.
• This challenges the “more is always better” exercise mindset. While most people still need to move more, the research suggests there may be diminishing returns or even potential harm from extreme exercise levels when it comes to brain health.

https://studyfinds.org/exercise-too-little-too-much-brain-age/