Our hypothesis is that healthy lifestyles improvement by an intervention designed according 8 social marketing Benchmark criteria, can reduce overweight or obesity implemented by adolescents on their colleges.

The general aim of EYTO program is to improve health and well-being among adolescents who live in low socioeconomically communities, through an intervention study designed by selected adolescents with the inclusion of social marketing Benchmark criteria.

5 adolescent coordinators (of intervention high-schools) will be trained by experts in social marketing and health promotion. This 5 selected adolescent as coordinators who will be in charge of the design of an 8 social marketing criteria intervention to implement their peers´ lifestyles.

The program has over two academic years. The participants will be followed for the duration of 2 academic years, an expected of up to 16 months.

Inclusion Criteria:

• Informed consent signed by parents and/or guardians.
• Adolescents between 13 and 17 years old.

Exclusion Criteria:

- The lack of one or more inclusion criteria.