1. From the Center for Human Nutrition, Johns Hopkins University, Baltimore (BC); the Division of Epidemiology, University of Minnesota, Minneapolis (JHH); the Department of Physiology, University of Arizona, Tucson (TL and SG); the Department of Pediatrics, University of New Mexico, Albuquerque (SMD); the Departments of Nutrition and Epidemiology, University of North Carolina at Chapel Hill (JS); t