Effectiveness Evaluation of Three Strategies of Promotion of Healthy Dietary and Physical Activity Behaviours to Prevent Weight Excess Among Teenagers

1.Educational strategy. The strategy is to implement health promotion actions aiming at developing personal skills to adopt healthy behaviors in the field of nutrition and physical activity in conformity with up-to-date recommendations and references. Each adolescent will be provided with about 50 education hours distributed in individual and collective activities in school (15 hours), interventions during courses (20 hours), and outdoors activities (15 hours).

2\. Screening strategy. Screening includes measurement of BMI and plotting the growing chart with adolescents, measurement of eating troubles. Screening will be performed by the school medical and nurse team. At risk subjects will be defined according to precise criteria and will be referred to the GP and to obesity networks developed by Health Insurance system where they are provided with specific activities with dieticians, physical activity teachers and psychologists. Subjects with psychological difficulties will be referred for psychological care.

3\. Environmental strategy. The strategy is to develop in schools favorable and supportive environments for healthy behaviors targeting the collective catering and physical activity offer and the establishment policy. Especially actions aim at increase fruits and vegetables availability, water consumption, physical activity inside the schools.