Functional Gastroenterology: Assessing and Addressing the Causes of Functional Gastrointestinal DisordersThe Rome IV criteria refer to functional gastrointestinal conditions as "Disorders of Gut Brain Interaction". These conditions are involved in an estimated 40% of patient visits to gastroenterologists. Naturopathic functional diagnosis and individualized treatment are uniquely suited for good outcomes with these disorders. In Functional Gastroenterology, Steven Sandberg Lewis, ND, DHANP, draws on skills and knowledge he has built during four decades