1. From the Beltsville Human Nutrition Research Center, US Department of Agriculture, Agriculture Research Service, Beltsville, MD (KSS, DJB, KS, DRP, GKW, and WVR), and the Clinical Research Branch (PS and LF), and the Laboratories of Cardiovascular Science (SSN), Experimental Gerontology (DKI), Immunology (DLL), and Neurosciences (MPM), National Institute on Aging Intramural Research Program, Balt