This Gut Microbe Could Be the Secret to Staying Strong as You Age

Key Points:

• Researchers have identified the gut bacterium Roseburia inulinivorans as positively associated with greater muscle strength and improved muscle metabolism in both humans and mice, suggesting it may influence muscle function through the "gut-muscle axis."
• In a study analyzing stool samples from young and older adults, higher levels of R. inulinivorans correlated with increased handgrip strength and better performance in muscle strength tests, with older adults showing a 29% strength increase when the bacterium was present.
• Mouse experiments demonstrated that supplementation with R. inulinivorans enhanced forelimb grip strength and increased the proportion of fast-twitch muscle fibers, which are critical for powerful, short bursts of movement.
• The abundance of R. inulinivorans declines with age, paralleling the increase in sarcopenia (age-related muscle loss), indicating its potential as a probiotic candidate to help preserve muscle strength in older individuals.
• While promising, the findings require further long-term studies to confirm causality and explore mechanisms, as well as to evaluate the practical use of R. inulinivorans as a treatment for muscle decline.