Many people who try an Ancestral Diet don’t get adequate relief for their digestive complaints. A key reason why may be the presence of SIBO. This presentation will discuss symptoms, causes, pathophysiology, diagnosis and treatment of SIBO. A simple breath test can diagnose SIBO and treatments include diet, antibiotics, herbal antibiotics, elemental diet, and probiotics. Central in all treatment of SIBO is a low- carbohydrate, grain-free diet (Specific Carbohydrate Diet, Gut and Psychology Diet, modified Low Fodmaps Diet). Discussion will include why an ancestral diet can benefit digestion and how the SIBO diets differ from standard Paleo/Primal diets.