Scientists uncovered how long-term exercise activates a kidney-betaine pathway that rejuvenates immunity, metabolism, and inflammation control. Remarkably, betaine supplements reproduced many of these effects, suggesting a practical shortcut to exercise’s anti-aging power. Credit: Shutterstock A new study in the journal Cell from the Chinese Academy of Sciences and Xuanwu Hospital Capital Medical University explains how exercise helps the body stay youthful. The researchers also highlight