Rachel Meltzer Warren, MS, RDN is a New York area-based nutrition writer, educator, and counselor. In her private practice as a nutrition counselor, she specializes in helping young people as well as adults and families. She is the author of the book The Smart Girl's Guide to Going Vegetarian and is a consultant for Harlem Children's Zone where she develops and teaches programs on nutrition and wellness. She has contributed to Women's Health, Shape, Vegetarian Times, Good Housekeeping, and more. William D. Chey, MD, AGAF, FACG, FACP, RFF, is Professor of Medicine, Director of the GI Physiology Laboratory, and Co-Director of the Michigan Bowel Control Program at the University of Michigan. He also runs a clinical research group, serves as Co-editor-in-Chief of the American Journal of Gastroenterology, and is on the Board of Trustees of the American College of Gastroenterology and the Board of Directors of the Rome Foundation and Advisory Board of the International Foundation for Functional Gastrointestinal Disorders (IFFGD).