There has been scientific recognition of the gut affecting brain function for well over 100 years. This might help it make more sense: https://www.ncbi.nlm.nih.

There has been scientific recognition of the gut affecting brain function for well over 100 years. This might help it make more sense: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5772764/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5772764/