GUT HEALTH AND MOOD Over 90% of the cells in our body are non-human. This microbial ecology, found largely in our digestive system, is connected to processes in our bodies in a sophisticated way. these microbes are responsible for our health. They influence trajectory of our well being. The S.A.D. (standard American diet) is wreaking havoc on the healthy balance required for health – including brain health. Check out the latest science supporting this truth.