Institute of Medicine (U.S.). Committee on Prevention of Obesity in Children and Youth ; Koplan, Jeffrey ; Koplan, Jeffrey P. ; Kraak, Vivica I. ; Liverman, Catharyn T. ; Catharyn T. Liverman ; Institute of Medicine (U.S.) ; Jeffrey P. Koplan ; Vivica A. Kraak ; Board on Health Promotion and Disease Prevention ; Committee on Prevention of Obesity in Children and Youth ; Food and Nutrition Board ; Kraak, Vivica A.