Reed Mangels, PhD, RD, LD, FADA, is a nutrition advisor for the nonprofit educational Vegetarian Resource Group, as well as nutrition editor and a regular columnist for Vegetarian Journal. She is the coauthor of the American Dietetic Association’s position paper on vegetarian diets, as well as their new food guide for vegetarians. Dr. Mangels is an instructor in the nutrition department of the University of Massachusetts at Amherst.