"Some researchers believe that the microbiome may play a role in regulating how people think and feel."
https://www.theatlantic.com/health/...acteria-on-the-brain/395918/?utm_source=atlfb
https://www.theatlantic.com/health/...acteria-on-the-brain/395918/?utm_source=atlfb
Stephen Collins, a gastroenterology researcher at McMaster University in Hamilton, Ontario, has found that strains of two bacteria, lactobacillus and bifidobacterium, reduce anxiety-like behavior in mice (scientists don’t call it “anxiety” because you can’t ask a mouse how it’s feeling).
Humans also carry strains of these bacteria in their guts. In one study, he and his colleague collected gut bacteria from a strain of mice prone to anxious behavior, and then transplanted these microbes into another strain inclined to be calm. The result: The tranquil animals appeared to become anxious.