Exercise changes gut bacteria in just six weeks, new research reveals.
Previously inactive people who exercise for at least 30 minutes a day three times a week experience increased levels of gut bacteria that produce butyrate, a study found.
Butyrate is an anti-inflammatory acid that has been linked to protection against bowel cancer, as well as weight loss and stronger immunity.
The same findings were previously found in mice, who became less likely to develop the inflammatory bowel disease ulcerative colitis if they were active.
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