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Gut Bacteria's Role in Anxiety and Depression: It’s Not Just In Your Head

Mounting evidence shows that gut bacteria affect mental health. Experts are now testing psychobiotics as as depression, anxiety and other mental health remedies.

Credit: Coolgraphic/Shutterstock

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This article was originally published on Oct. 4, 2020.

This article appeared in the November 2020 issue of Discover magazine as "Gut Feeling." Subscribe for more stories like these.

Every muscle fiber in Tom Peters’ body seemed to be conspiring to keep him in bed. His depression — an occasional visitor for more than a decade — had reemerged in the summer of 2019, and his legs and arms felt like concrete. The thought of spending another 12-hour day at his computer filled him with dread. As a technical day trader for stocks, he responded to demanding clients constantly. That felt impossible when his brain kept blaring his past failures at top volume.

Fielding the volley of work messages became a Sisyphean task. “There’s always the overriding fear that I’m not going to come out of it, that I’m always going to feel this way,” Peters says. “That probably is ...

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