Recent studies and advances in diagnosis show that at least 3 million Americans, or about 1 in 133 people have celiac disease, an autoimmune condition that affects the lining of the small intestine, commonly caused by the body's inability to properly process gluten. But it is also estimated that less than 1 in 5 of those living with Celiac disease are ever diagnosed.  We welcome back Dr. Neil Nandi, with The American College of Gastroenterology's Patient Care Committee, to discuss the symptoms, diagnosis, testing, and treatment for celiac disease, as well as the role of gluten in your diet and why you may want to reconsider a gluten-free diet if you don't have celiac disease or non-celiac gluten sensitivity.