Animal study · Supplements / medicine · 21 Aug 2026
This gut microbe may help keep you strong as you age
Source: ScienceDaily
What the research found
Study. Dutch and Spanish researchers writing in Gut linked Roseburia inulinivorans to muscle strength. Among older adults, those with detectable R. inulinivorans had about 29% higher handgrip strength than those without. In mice, the same species raised forelimb grip by about 30% after 4–8 weeks and shifted calf muscle toward larger, fast-twitch type II fibers; other Roseburia species did not. Abundance was lower in older than young adults. This is not a human sarcopenia trial. A commercial probiotic for this claim is weakly evidenced. Food-first fiber remains educational; not a diagnosis or a treatment.
Evidence level: Animal study. Results in animals or cells often don't carry over to people.
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