There are a few ways the brain has been proven to affect the gut: stress causes increase in gut motility, and changes in bacteria. I don't think there's much ev

There are a few ways the brain has been proven to affect the gut: stress causes increase in gut motility, and changes in bacteria. I don't think there's much evidence of the gut bacteria affecting the brain, except in the case of an ongoing infection. I'm curious which lifestyle changes you made. The changes that seem to help with CFS and low cortisol involve increasing activity, not just reducing stress.