RESUMO
Obesity is a pathologic entity characterized by an increase in fat body mass and is a global public health problem. In Spain, between 1984 (the Paidos study) and 2000 (the enKid study), the prevalence of childhood overweight and obesity increased and significant differences were found among the autonomous communities. Consequently prophylactic measures were implemented throughout the country and in 2005 the Ministry of Health developed the NAOS strategy (strategy for nutrition, physical activity and obesity prevention). Within the medical area of this intervention, primary care pediatricians acquire a key role. Aware of this, the Spanish Association of Pediatrics, through the Nutrition Committee, aims to provide information on the current situation concerning the etiopathogenesis and early identification of at-risk populations. The epidemiology and risk periods in the pediatric age group are reviewed and recommendations on healthy lifestyle are provided, bearing in mind diet and physical activity throughout childhood, with the aim of preventing overweight and obesity.