David S. Seres, MD, ScM, PNS, is director of medical nutrition and associate professor of medicine at Columbia University Medical Center, New York, New York, and a member of the American Council on Science and Health Scientific Advisory Panel. Dr. Seres is also currently a member of the Medical Advisory Board for Consumer Reports, was chair of Physician Certification for the National Board of Nutrition Support Certification and chair of the Medical Practice Section for the American Society for Parenteral and Enteral Nutrition (A.S.P.E.N.). He is coauthor of multiple safety guidelines, chapters, editorials, and invited reviews, and appears frequently in the media advocating to consumers against dangerous foods, supplements, and nutritional practices.