#muscle

'Strong muscles start in the gut'

"Aging naturally weakens our muscles, but researchers at Leiden University Medical Center and the Universities of Granada and Almería have found a gut bacterium that may help turn the tide. Their findings, now published in the scientific journal Gut, show that Roseburia inulinivorans is linked to stronger muscles in both people and mice."

"Older adults who carried this bacterium had 29 percent stronger handgrip strength than those who didn’t.” In young adults, higher levels of Roseburia inulinivorans were associated with stronger muscles and better overall fitness."

"After clearing the mice’s gut bacteria using antibiotics, they introduced human strains of Roseburia inulinivorans for eight weeks. […] The mice became 30 percent stronger, developed larger muscle fibers and produced more fast‑twitch fibers, the kind needed for quick, powerful movements."

"The team also found that the bacterium changed how the muscles used certain building blocks and activated energy‑related pathways inside the muscle. “These metabolic changes may help explain why the muscles grew stronger"

"Another key observation is that levels of Roseburia inulinivorans naturally decline with age. “This could partly explain why muscle strength drops as we get older"

https://www.lumc.nl/en/news/2026/strong-muscles-start-in-the-gut/

#health #muscle #strength #fitness #RoseburiaInulinivorans #gut #bacterium