In animal studies, boosting serotonin in the cells that line the gut reduced anxious and depressive-like behaviors without causing cognitive or gastrointestinal side effects.

Most of us have experienced the effects of moods and emotions on our gastrointestinal tract, from "butterflies" in the stomach caused by nervousness to a loss of appetite when we're feeling blue.

New work could revolutionize our understanding of how the composition of the gut microbiome is determined and open the door ...