Objectives: To examine psychosocial factors, BMI, perceived weight, and demographics as correlates of adolescents' intentions to prevent excessive weight gain. Methods: Students (12-13 years) completed questionnaires at baseline and 4-month follow-up. Regression analyses were performed (n=345). Results: Sixty percent showed a positive intention towards the prevention of excessive weight gain. A positive change in attitude and perceived internal control and higher perceived weight were related to a positive change in intention. Conclusion: A small majority of adolescents had a positive intention to prevent gaining excessive weight. A positive attitude and higher perceived internal control were related to a positive intention.