Cutting just one specific amino acid out of a male mouse's diet made him live 23% longer.
April 2, 2026
Original Paper
Lifelong restriction of dietary valine has sex-specific benefits for health and lifespan in mice
bioRxiv · 2025.08.31.673254
AI-generated illustration
The Takeaway
While general protein restriction is known to help, this study shows that cutting back on just one specific building block—valine—is enough to significantly reduce frailty, cancer, and age-related brain inflammation. The effect was remarkably potent in males, equivalent to a human living decades longer just by tweaking one nutrient.
From the abstract
Dietary protein is a key regulator of metabolic health in humans and rodents. Many of the benefits of protein restriction are mediated by reduced intake of dietary branched-chain amino acids (BCAAs; leucine, valine and isoleucine), and restriction of the BCAAs is sufficient to extend healthspan and lifespan in mice. While the BCAAs have often been considered as a group, it has become apparent that they have distinct metabolic roles, and we recently found that restriction of isoleucine is suffici