The key objective of this project is to develop a computer simulation model of school food policies that will simulate their effects on youth overweight and obesity rates. This computer model also will provide a user-friendly synthesis of current research, which will provide an accessible means by which practitioners, schools, and other stakeholders might develop and prioritize policies and develop a comprehensive and coherent program to address this critical public health issue. The study will utilize a population model through age 18. All available published research to date will be assessed for entry into the simulation model, including data focusing on racial/ethnic minorities and low socioeconomic status groups.