Mental health problems
Up to 95% of serotonin - the "happiness hormone" - and 50% of dopamine are produced in the gut. Colonic bacteria and their products stimulate their production, so they directly influence the production of these substances.
Up to 95% of serotonin - the "happiness hormone" - and 50% of dopamine are produced in the gut. Colonic bacteria and their products stimulate their production, so they directly influence the production of these substances.