1. Analytical and Applied Sciences Group, Mars, Incorporated, 800 High Street, Hackettstown, New Jersey 07840, Department of Nutrition, University of California Davis, 1 Shields Avenue, Meyer Hall, Davis, California 95616, U.S. Department of Agriculture, Agricultural Research Service, Jean Mayer Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, Massachusetts 02111, and Mars, Incorporated, P.O. Box 31, 5460 BB Veghel, The Netherlands