A prospective bariatric database was carried out in the Department of Digestive and Endocrine Surgery at the University Hospital of Strasbourg, France, starting in January 1996. All potential candidates for obesity surgery were prospectively registered in the database. Patients were informed by the bariatric surgeon of the prospective database, and of the possibility of utilizing personal data for research purpose after anonymization. A case-control study was performed, to compare the quality of life (QoL) of patients treated for internal hernia (IH group) with the QoL of patients with an uncomplicated course after Roux en Y gastric bypass (Uncomplicated RYGB group).