1. Program in Nutritional Metabolism (M.T., S.S., K.V.F., K.W., E.P., S.K.G.) Boston, Massachusetts 02114
2. Division of Musculoskeletal Imaging and Intervention (M.T.), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114
3. Section on Integrative Physiology and Metabolism (T.T., C.R.K., A.M.C.), Joslin Diabetes Center and Harvard Medical School, Boston, Massachusetts 02215
4. Translational Physiology Section, Diabetes, Endocrinology, and Obesity Branch, National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Diseases (A.M.C.), Bethesda, Maryland 20892