The gastrointestinal tract, the “inner tube” of the body, winds a long way from start to finish. Its health is essential to good nutrition, but a lot can go wrong along the way. Our eat-on-the-run diets cause heartburn, pain relievers can trigger bleeding ulcers, and low-fiber food can bring on constipation. We’ll find out how to cope with common digestive woes. Guest: Nicholas J. Shaheen, M.D., M.P.H. Associate Professor of Medicine and Epidemiology, and Director of the Center for Esophageal Diseases and Swallowing at the University of North Carolina School of Medicine.