Currently, school-based health promotion programs are conceptualized as including curriculum and related organizational factors that support healthy behavior. The existence of comprehensive programs is limited throughout the nation. The results of numerous school-based nutrition studies report changes in students' knowledge about nutrition. Several studies based on social learning theory report changes in behavior and knowledge about nutrition. Although health education interventions may succeed in increasing children's knowledge and producing changes in behavioral intentions and behavior, the behavioral changes may not be maintained unless the school environment and children's parents reinforce the intentions.