Study on the Appropriateness of Bariatric Surgery in Adolescents

Inclusion Criteria: * failure of weight loss in an organized care\> 6 months * BMI \> à 35 kg/m2 with presence of severe co-morbidities (diabetes, moderate or severe OSAS, intracranial hypertension, severe hepatic steatosis), which can be improved by a significant weight loss and sustainable OR BMI \> or = 40 kg/m2 with less severe co-morbidities (hypertension, GERD) and may worsen the health status including reduced quality of life. * Patients must have completed their growth (bone age \> 13 for girls and \>15 for boys). * The teenager and his legal representative must have given their informed consent. * The subject must be affiliated to a social security scheme Exclusion Criteria: * syndromic obesities * tumor-induced obesity * Patient with severe psychiatric disorders * Patient with eating disorders * Patients under judicial protection * Patient under guardianship or curatorship * Patient participating in another study