Inclusion Criteria:  Be between 18 and 65 years old. Have had a gastric bypass in Y more than 2 years ago Have a weight regain of more than 10% of the lowest weight after the first intervention. Have benefited from a multidisciplinary medico-psychological reassessment. Understand the interest of the study and agree to long-term follow-up. Agree to be included in the study and have signed a consent form in a free and informed manner. Be affiliated with health insurance. For female patients of childbearing potential, have an effective method of contraception  Exclusion Criteria:  Presence of a disease unrelated to obesity that is life-threatening. Pregnancy or wish to become pregnant within the year. "Breastfeeding" patients Female patients of childbearing age and unable or unwilling to use an effective method of contraception Presence of an unhealed gastric ulcer or stenosis of the gastrointestinal anastomosis Presence of a psychiatric pathology compromising the proper understanding of the study or patient under guardianship or guardianship. Patient not understanding French or unable to give consent. Patient already included in a study or in conflict of interest with this study.