Longevity & Aging

Specific Gut Bacteria Species Boosts Muscle Strength and May Combat Age-Related Decline

Researchers identified a specific gut bacteria, Roseburia inulinivorans, that significantly enhances muscle strength in both humans and mice. Unlike other Roseburia species, this particular bacterium was associated with improved handgrip, leg press, and bench press performance. Mouse studies confirmed causality, showing increased grip strength after supplementation. The bacteria works by altering muscle metabolism, reducing amino acid levels while activating energy pathways, leading to larger muscle fibers and a shift toward stronger type II muscle fibers. Notably, older adults had lower levels of this beneficial bacteria, suggesting its potential role in age-related muscle decline and as a targeted probiotic intervention.