Study design: A single-center pilot open-label randomized control trial. Population: The study will comprise a total of 100 subjects of both sexes, between 6 and 18 years of age, obese, according to the IOTF criteria and with visceral adiposity, as waist circumference ≥ 90th percentile, pubertal stage ≥ 2 according to the Tanner stage, HOMA-IR > 2,5 or insulin > 15 µU/ml, diet naïve or with failure of weight loss (defined as -1 kg/m2 BMI in 1 year).