1. From the Department of Nutrition (T.T.F.), Simmons College, Boston, Mass; the Departments of Nutrition (T.T.F., M.J.S., W.C.W., F.B.H.) and Epidemiology (M.J.S., J.E.M., W.C.W., F.B.H.), Harvard School of Public Health, Boston, Mass; and the Channing Laboratory, Department of Medicine (M.J.S., J.E.M., K.M.R., W.C.W., F.B.H.), Boston, Mass.