Inclusion Criteria:  Patients who received 10 ± 2 years ago (between 2009 and 2013) an OAGB with a 150 or 200cm biliary limb. Patients should be consecutive at each center. Patients fulfilling the criteria of indication for bariatric surgery at the time of their intervention according to the recommendations of the HAS (HAS, 2009) in an expert center. Patients agreeing to perform an endoscopic evaluation with biopsies at 10 years Patients who gave their consent Patients with health insurance coverage  Exclusion Criteria:  Contraindication to bariatric surgery defined according to HAS recommendations (HAS, 2009) Persons deprived of liberty, under guardianship, or under curatorship Patients included in a protocol with a conflict of interest with OMEGA10.