1. From the Department of Dietetics and Nutrition, University of Kansas Medical Center, Kansas City, KS (CLC and SEC); the Schiefelbusch Institute for Life Span Studies (CLC and JC) and the Department of Psychology (JC), University of Kansas, Lawrence, KS; and the RL Smith Mental Retardation and Developmental Disabilities Research Center, University of Kansas Medical Center, Kansas City, KS (SEC)