In the first study of its kind in Mexico, Options has just completed a PEER study (Participatory Ethnographic Evaluation and Research) with young people in Toluca, Estado de Mexico. The work was commissioned by PSI Mexico, who are developing a pilot social marketing strategy to address rising obesity among young people in Mexico. PEER was used to provide insights into attitudes towards physical activity, dietary decision making, and norms around body image. Results will inform a new programme to promote physical activity and drinking water (as opposed to soft drinks) among teenagers in the city.