Donald Hensrud, M.D., M.P.H., is chair of the Division of Preventive, Occupational, and Aerospace Medicine and a consultant in the Division of Endocrinology, Metabolism and Nutrition at Mayo Clinic, Rochester, Minn. He is also an associate professor of preventive medicine and nutrition at the College of Medicine, Mayo Clinic. A specialist in nutrition and weight management, Dr. Hensrud advises individuals on how to achieve and maintain a healthy weight. He conducts research in weight management, and he writes and lectures widely on nutrition-related topics. He helped publish two award-winning Mayo Clinic cookbooks.