Bacteria found in the human intestine capable of improving muscle strength (ugr.es)

Researchers involving the University of Granada report that an intestinal bacterium of the Roseburia genus—especially Roseburia inulinivorans—is linked to greater muscle strength and physical fitness. The study, published in *Gut*, found the bacterium was associated with stronger grip strength and better cardiorespiratory capacity in young adults, and greater handgrip strength in older adults, where its abundance appeared lower. Mouse experiments suggested the bacterium can improve muscle performance and muscle fiber characteristics, though the authors note limits and call for longer-term work to confirm cause.