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 commercial advertising and marketing for food. In 2009, children aged 2-11 saw an average of more than 10 television food ads per day (Powell et al., 2011). Children see and hear advertising and marketing messages for food through many other channels as well, including radio, movies, billboards, and print media. Most notably, many new digital media venues and vehicles for food marketing have emerged in recent years, including Internet-based advergames, couponing on cell phones, and marketing on social networks, and much of this advertising is invisible to parents.