This document discusses using social marketing approaches to address childhood obesity at multiple levels. It provides an overview of ecological models in public health and describes how the Chicago 5-4-3-2-1 Go! program applied social marketing strategies to raise awareness of healthy behaviors and local opportunities for physical activity and nutrition among parents and children in the community. Lessons from this initiative demonstrate the effectiveness of social marketing campaigns in promoting policy changes and reducing behavioral risk factors for obesity through culturally relevant messages and multi-pronged community outreach.