Nowadays, unhealthy lifestyles are associated with some chronic diseases, especially obesity. If the improvement of healthy lifestyles occurs during childhood or adolescence, long-term effectiveness can be achieved. To improve healthy lifestyles, interventions that use strategies such as social marketing (based on commercial marketing, including 8 criteria to choice healthy options) and peer-led methodology (also known as peer education, is based in the transmission of healthy messages from peers to peers), have demonstrated effectiveness in youth health promotion.