Authors: Rafael Perez-Escamilla, PhD; Julie E Obbagy, PhD, RD; Jean M Altman, MS; Eve V. Essery, PhD; Mary M. McGrane, PhD; Yat Ping Wong, MLS, MPH; Joanne M. Spahn, MS, RD, FADA; Christine L Williams, MD, MPH. Interview: Rafael Perez-Escamilla, PhD, Yale University, and Julie E. Obbagy, PhD, RD, USDA Center for Nutrition Policy and Promotion's Evidence Analysis Library Division, discuss the implications of a new report published in the Journal regarding the growing body of evidence linking energy density, the number of calories in a given amount of food, and body weight in adults as well as children and adolescents. Published online: April 3, 2012 (DOI: 10.1016/j.jand.2012.01.020).