The major hypothesis is that by the end of the 16-month study, children in the intervention schools will have significantly lower body mass index (BMI) and body fat percentage after adjustment for baseline values, as compared to children in the control schools. The primary outcome measures in children are BMI and percent body fat. Secondary measures include child's total daily physical activity, nutrient and food-group analysis of school meals and snacks, and assessment of classroom food and physical activity practices. Child measures will occur at the beginning of kindergarten, at the end of kindergarten (BMI only), and at the end of the 1st grade. Parents will be surveyed at the beginning of their child's kindergarten year, and when their child is at the end of 1st grade. Parent assessments will include measures of household food availability and reports of their own and their child's eating and physical activity behaviors.