SOURCES: Leslie Bonci, MPH, RD, author, American Dietetic Association Guide to Better Digestion. American College of Gastroenterology. National Digestive Diseases Information Clearinghouse. Academy of Nutrition and Dietetics. Mayo Clinic. Jeffrey Roberts, founder and president, IBS Self Help and Support Group. Lynn Jacks, founder, IBS support group, Summit, NJ. Beth Schorr-Lesnick, MD, FACG, gastroenterologist, Montefiore Medical Center, New York. GlaxoSmithKline. National Center for Biotechnology Information. MedlinePlus. The Food Allergy and Anaphylaxis Network.