24/10/2025
đď¸ââď¸ Exercise helps your digestive system too, thanks to changes in gut bacteria.
Working out is good for your gut as a new study found that exercise, especially when itâs intense, doesnât just strengthen your muscles and heart but also changes the community of microbes living in your digestive system in ways linked to better health.
Researchers at Edith Cowan University followed 23 elite rowers during high-intensity training before a big competition and again during their âoff seasonâ when they trained much less.
They found that during the intense training period, the rowersâ guts produced much higher levels of short-chain fatty acids (or SCFAs) like butyrate and propionate, compounds tied to healthier gut linings, lower inflammation, and better energy metabolism. Their digestion also sped up, with nearly all athletes having daily bowel movements, and their gut bacteria shifted toward more Bacteroidota, which are known for breaking down complex carbs and supporting a leaner, more efficient metabolism. Scientists think one reason for this is lactate, the substance muscles make during hard exercise, which travels to the gut and feeds microbes that turn it into these beneficial SCFAs, also keeping gut acidity at healthy levels.
During the off-season, despite eating similar amounts of carbs and fiber, the athletesâ diets worsened, less produce, more takeout and alcohol, and their gut health declined, with slower digestion, lower SCFA levels, and fewer Bacteroides, suggesting intense exercise may directly boost gut function.
Source: Charlesson B., Jones J., Abbiss C., Peeling P., Watts S., Christophersen C.T. âTraining load influences gut microbiome of highly trained rowing athletes.â Journal of the International Society of Sports Nutrition, 2025.