Research Program in Men's Health: Aging and Metabolism, Boston Claude D. Pepper Older Americans Independence Center for Function Promoting Therapies, Brigham and Women's Hospital, United States. Electronic address: sbhasin@partners.org. Section of Endocrinology, Diabetes and Nutrition, Boston Medical Center, United States. Institute for Aging Research, Hebrew SeniorLife, Division of Gerontology, Beth Israel Deaconess Medical Center, United States. Research Program in Men's Health: Aging and Metabolism, Boston Claude D. Pepper Older Americans Independence Center for Function Promoting Therapies, Brigham and Women's Hospital, United States. Section of Preventive Medicine and Epidemiology, Boston Medical Center, Boston, MA, United States. Department of Nutrition Science, Purdue University, West Lafayette, IN, United States.