The document summarizes the results of the First International Consensus Conference on Mini-Gastric Bypass/One Anastomosis Bypass held in Paris in 2012. 112 surgeons from 29 countries completed a survey on their techniques and results. The conference developed a consensus on the technical performance of the procedure, which involves creating a small gastric pouch and bypassing most of the stomach and small intestine. Results reported were excellent weight loss and resolution of diabetes in the majority of patients.