Many of the gastrointestinal or even other diseases (metabolic as in obesity, or autoimmune as in allergies) involve primarily the human gut microbiota and then according to specific changes in microbiota equilibrium certain effects occur on either bowel motility (as in irritable bowel syndrome: IBS), homeostasis of the GI immune system (as in inflammatory bowel disease: IBD), or mucosal cells proliferation (as in adenoma - colorectal cancer: CRC). These chronic diseases affect all nations worldwide and represent a significant public health burden. They can be seen among children, adolescents, and adults. Currently there is no medical cure for IBS, IBD or CRC once they develop.