The main objective is to evaluate the effect on BMI of a school-based program that discourages the consumption of all sweetened beverages, encourages the reduction in sugar intake, and encourages the increase in physical activity among adolescents and their families from a low socioeconomic area.

Specific objectives are:

1. To compare total, lean, and fatty body mass variation in adolescents aged 11 to 14, from 7th and 8th grades from schools under intervention and from the ones not subjected to the intervention program.
2. To compare sweetened beverages consumption and sugar intake before and after the intervention in both groups of schools.
3. To evaluate the impact of the intervention on the selling of sweetened beverages in the cafeterias.
4. To compare change in family expenditures with sweetened beverages and sugar.

Inclusion Criteria:

• 5th grades

Exclusion Criteria:

• Pregnancy