Exercise Changes Our Gut Microbes, But How Isn’t Yet Clear

Physical activity, independent of diet, shifts the composition of bacteria in the intestines, spurring researchers to search for species that might provide benefits akin to working out.

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When Sara Campbell first typed “exercise and microbiome” into PubMed in 2010 and hit enter, “the search literally said zero,” she tells The Scientist. Campbell was just beginning an assistant professorship in exercise science at Rutgers University. Being an athlete herself and having studied cholesterol metabolism and exercise and diet during her PhD and postdoc, she started to wonder if exercise could influence the microbes in the gut.

“We know that exercise does all of these incredible things,” Campbell says, such as keeping inflammation down and enhancing antioxidant defenses. And so she thought, “well, if there’s symbiosis and mutualism that go on between the host and the microbes, there has to be something going on . . . something changing about the microbes” during exercise. When her PubMed search came up empty, she decided: “I’ve got to study this.”

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Meet the Author

  • Ashley Yeager

    Ashley started at The Scientist in 2018. Before joining the staff, she worked as a freelance editor and writer, a writer at the Simons Foundation, and a web producer at Science News, among other positions. She holds a bachelor’s degree in journalism from the University of Tennessee, Knoxville, and a master’s degree in science writing from MIT. Ashley edits the Scientist to Watch and Profile sections of the magazine and writes news, features, and other stories for both online and print.

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