The Robert Wood Johnson Foundation's national Healthy Eating Research program supports research on environmental and policy strategies with strong potential to promote behavior that will prevent childhood obesity, especially among low-income and racial/ethnic populations at highest risk. Findings will advance RWJF's efforts to reverse the childhood obesity epidemic by 2015. The program's Round Four funding focuses on studies of policy and environmental strategies in food pricing and economic approaches; food and beverage marketing; improving access to healthy foods in low-income communities; and evaluations of promising food-related policy and environmental strategies in settings where children and their families make food choices. Preference will be given to public entities and nonprofit organizations. Approximately $2.4 million in total funding will be awarded. Small- and large-scale studies will be eligible for 12- to 18-month awards of up to $150,000 each, and 18- to 36-month awards of up to $400,000 each. Macro-level analyses will be eligible for 12- to 18-month awards of up to $100,000 each.