1. From the Lipid Metabolism Laboratory, Jean Mayer USDA Human Nutrition Center on Aging at Tufts University and Division of Endocrinology, Metabolism, Diabetes, and Molecular Medicine (B.F.A., M.B., K.V.H., C.E.C., G.E.D., E.J.S.), New England Medical Center, Boston, Mass, and Department of Medicine, Division of Cardiology (J.S.M., G.B.B.), University of Washington, Seattle, Wash.