 In this observational follow-up study of a randomised clinical trial a maximum of 29 study participants may be included. These study participants were previously enrolled in the EndoBarrier device study at the MUMC or the Atrium Medical Centre Heerlen. The focus of this study lays on the long-term outcomes measured by EWL, postoperative blood sampling and questionnaires. These measurements, samples and questionnaires will be taken to assess the long-term effectiveness of the EndoBarrier device in the treatment of morbid obesity. Participants who were previously enrolled in the EndoBarrier device study at the MUMC or at the Atrium Medical Centre in Heerlen and who have agreed to participate in this study will be requested to arrive at the outpatient clinic of the MUMC after an overnight fast. Blood sample will be taken for total cholesterol, HDL, LDL, triglycerides, Hb, Ht, iron, HbA1c, insulin levels, glucose, amylase, lipase, C-peptide, Creatinine, vitamin D, Calcium, ALAT, ASAT, AF, gamma GT, albumin, CK-18, L-FABP, FGF19, Total bile salts and bile salt composition. These parameters are associated with risk factors in morbid obesity namely: Nonalcoholic Fatty Liver disease, hypertension, diabetes mellitus type II DMII, coronary heart disease and osteoarthritis. After the blood sampling, physical health will be assessed by means of standard physical examination weight, waist size, length, blood pressure, heart rate, breathing frequency. Then, the participant will be requested to fill in a validated questionnaire. In this study the SF-36 quality of life questionnaire will be used. This is a validated questionnaire assessing non-specific symptoms and quality of life after Bariatric surgery. 