The purpose of this study is to design, implement and evaluate an intervention oriented to change alimentary practices and patterns of physical activity of children through educative activities with parents, teachers and children in school of Mexico city.

In Mexico, obesity is becoming the most public health problem. The increase in body mass is associated with the changes in the alimentary environment, resources for physical activity in a context of poor health literacy of the population and low efficacy of the health system. Schools, as social settings, are a opportunity for obesity prevention.

The study includes three phases: 1) evaluation of training, in which the psychological context in which obesity is generated is evaluated. The evaluation will be performed by collection of qualitative and quantitative information, 2) design a strategy from the information obtained. The intervention will include working sessions with teachers, parents and children, establishment of schools in window counseling in nutrition and physical activity and the secretion of a website to not communicate with the public and Provide information, 3) evaluation of the strategy in a community trial with two groups of schools, one intervention and one control.

Inclusion Criteria:

• Children students in selected schools
• Anthropometric diagnostic of normality or overweight
• Informed consent of parents

Exclusion Criteria:

• Children with special diet or children with limited motor functioning