1. From the Division of Preventive Medicine, Department of Medicine (JL, IML, NRC, JEM, JEB, and SMZ), Channing Laboratory (JEM), and Department of Ambulatory Care and Prevention (JEB), Brigham and Women's Hospital and Harvard Medical School, Boston, MA; the Department of Epidemiology, Harvard School of Public Health, Boston, MA (IML, NRC, JEM, JEB, and SMZ); the Jean Mayer US Department of Agricult