Gut bacteria may play a role in anxiety

Making dietary changes has a positive effect on symptoms, review of the research shows
FODMAP diet

A recent systematic review has found that regulating gut bacteria through dietary change and probiotic intake might help alleviate symptoms of anxiety.

And, further, the review of 21 studies suggested that changing what a person ate, such as following a low FODMAP diet, was likely more effective than adding in a probiotic supplement.