http://www.cdc.gov/pcd/issues/2009/jan/pdf/07_0240.pdf State Child Care Licensing Regulations Related to Nutrition, Physical Activity, and Media Use for Preschool-Aged Children in the United States. By Karen M. Kaphingst, MPH, and Mary Story, PhD, RD, Preventing Chronic Disease, Vol. 6, No. 1, January, 2009, published by the Centers for Disease Control and Prevention.