The childhood obesity epidemic is an urgent public health problem. The most recent data available show that nearly 19 percent of boys and about 15 percent of girls aged 2-19 are obese, and almost a third of U.S. children and adolescents are overweight or obese (Ogden et al., 2012). The obesity epidemic will continue to take a substantial toll on the health of Americans. In the midst of this epidemic, children are exposed to an enormous amount of...