More than 30% of adults and 15% of children in the United States are subject to increased disease burden and shortened life span as a result of obesity.1,2 Widespread fast-food consumption,3-6 increasingly sedentary lifestyles,7,8 and ubiquitous television viewing9-11have created a complex cultural fabric whose unraveling is vital to our understanding of the epidemic of obesity. For children, these cultural changes have been mirrored in the school environment where vending machines and soda sales are becoming commonplace, and physical education classes are increasingly becoming a thing of the past.12-14 Since adolescent overweight and obesity are highly correlated with adult obesity, there are growing public health efforts aimed at improving the nutritional content of children's diets, establishing healthy eating habits at a young age, and decreasing sedentary behavior.11,15,16