James A. Joseph, Ph.D., is lead scientist and lab chief of the Laboratory of Neuroscience of the USDA Human Nutrition Research Center on Aging at Tufts University. He has held positions at the National Institutes of Health, and has won several grants and awards in the area of gerontology. He lives in Plymouth, Massachusetts. Daniel A. Nadeau, M.D., is clinical director of the Diabetes Center and Nutrition Support at the Eastern Maine Medical Center in Bangor and assistant professor at Tufts Medical School. He lives in Hampton, Maine. Anne Underwood is a reporter for Newsweek, where she has been writing about health and medicine issues for seventeen years. She lives in Hoboken, New Jersey.