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Objective: To determine the current epidemiological situation, prevention and management of child and youth obesity based on the best scientific evidence available., Methodology: Literature search in PubMed, Cochrane, Science Direct, ENFISPO, Lilacs and SciELO, selecting articles about child and youth obesity, its prevention and treatment., Results: Child and youth obesity is a multifactorial chronic disease that it has been increasing, tending to stay in adolescence and adulthood with greater intensity than more early starts. The data vary from country to country, although most articles are governed by body mass index (BMI). Pediatric overweight is defined by a BMI percentiles located between 91-98 and obesity by a percentile equal or greater than 99. Its prevalence varies according to time, geography, age, gender and race. The prevalence rates of obesity in Spain are one of the highest around the world. The overweight prevalence is lower slightly and there is no difference in gender. Its implications include the metabolic syndrome and diabetes mellitus II. Unanimously, the combination of interventions on life and dietary habits and physical activity is important for the management of obesity and overweight., Conclusion: Currently, the obesity management requires a generalized approach, with changes in lifestyle, diet and physical activity. The best solution for reducing this epidemic lies in prevention rather than treatment.