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Susan B. Roberts, Ph.D., is Chief of the Energy Metabolism Laboratory at the Jean Mayer USDA Human Nutrition Research Center on Aging and Professor of Nutrition and Associate Professor of Psychiatry at Tufts University. She is an internationally recognized expert on infant and adult nutrition, with research publications on topics including infant nutrient requirements, infant and adult obesity, breast-feeding, nutritional needs of premature infants, and nutrition and aging.Melvin B. Heyman, M.D., M.P.H., is Professor of Pediatrics and Chief of the Division of Pediatric Gastroenterology, Hepatology and Nutrition at the University of California in San Francisco, where he directs an active clinical program. He also directs a research and training program focusing on nutritional treatment of acute and chronic diseases, childhood nutritional requirements, and food allergies.Lisa Tracy is an editor with The Philadelphia Inquirer and the author of two previous nutrition books.
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