Objective: To determine the presence of metabolic syndrome in overweight and obese adolescent population. Design: Clinical study. Setting: Endocrinology service. Hospital Nacional Dos de Mayo. Participants: Adolescents. Interventions: We studied 195 adolescents between 10 to 19 year-old. Inclusion criteria was that they should be overweight or obese. We used the reference population of Must et al. with the following diagnosis criteria: 85 to 95 percentile, overweight; higher than 95 percentile, obese. Weight, height and waist circumference (WC) were taken following international recommendations. Metabolic syndrome determination followed Cook recommendations (TG > 110, cholesterol HDL < 40 mg/dL, glycemia > 110 mg/dL y WC > 90 percentile), the presence of three or more of these criteria indicated metabolic syndrome. Main outcome measures: Setabolic syndrome, overweight, obesit...