Accumulating evidence suggests that engaging in regular physical activities is an effective preventive measure for a variety of health risk factors; however, across all age groups the levels of physical activity remain low (Tremblay et al, 2011). Likewise, eating behaviours established during childhood track into adulthood contribute to long-term health (Story and French, 2004). Nutrition during childhood is essential for grow and development, health and well-being (Karnik and Kanekar, 2012; Story and French, 2004). Physical activity and healthy behaviors are given as key factors to prevent obesity. This is why effective school-based intervention in order to promote health must include physical activity along with healthy diet education

The findings are not consistent, but generally suggest that combined diet and physical activity school-based interventions, may help prevent children becoming overweight in a long term period. Particularly in girls attending primary school, physical activity interventions may help to prevent these children from becoming overweight in the short term (Brown and Summerbell, 2009).

But generally this programs are, in a certain way, out of context since they do not consider the opinions/feedback from the people they aimed to. 

There seems to be an absence of published research relevant to the pre-adolescent population that as examined the views of children about health and also how to develop effective health promotion and sustainable obesity prevention programmes (Hesketh et al., 2005).

Health promotion identifies the need to listen and engage people within the context of their community and, in this sense, gradually programmes aimed at improving the health of children are being designed in partnership with children and parents (Potvin et al., 2003). Therefore of the present study was to listen and understand children´s perceptions about healthy behaviours concerning nutrition and active lifestyle.

Brown, T.; Summerbell, C. (2009). Systematic review of school-based interventions that focus on changing dietary intake and physical activity levels to prevent childhood obesity: an update to the obesity guidance produced by the National Institute for Health and Clinical Excellence. Obesity reviews, 10(1), 110-41. Hesketh, K.; Waters, E.; Green, J.; Salmon, L.; Williams, J. (2005). Healthy eating, activity and obesity prevention: a qualitative study of parent and child perceptions in Australia. Health Promotion International, 20(1), 19-26. Karnik, S.; Kanekar, A. (2012). Childhood obesity: a global public health crisis. Int J Prev Med, 3(1), 1-7. Potvin, L., Cargo, M., McComber, A. M., Delormier, T. and Macaulay, A. C. (2003) Implementing participatory intervention and research in communities: lessons from the Kahnawake Schools Diabetes Prevention Project in Canada. Social Science and Medicine,56, 1295–1305. Story, M.; French, S. (2004). Food Advertising and Marketing Directed at Children and Adolescents in the US. International Journal of Behavioral Nutrition and Physical Activity. 1:3 doi:10.1186/1479-5868-1-3 Tremblay, M.; LeBlanc, A.; Kho, M.; Saundres, T.; Larouche, R.; Colley, R.; Goldfield, G.; Gorber, S. (2011).Systematic review of sedentary behaviour and health indicators in school-aged children and youth. International Journal of Behavioral Nutrition and Physical Activity 8:98.