The microflora of the GI tract is an organ at the interface of the internal and external milieu that helps us adapt to the environment in which we live. We can modify the kinds of microflora in the gut to regulate immunity, metabolic processes, risk for gut infections, C diff and candida infections, and now even the tendency to get type 2 diabetes and fatty liver. Studies in germ free mice have documented that by transplanting stool from mice with type 2 diabetes and fatty liver into mice who are germ free, that the diseases are tranported as well.