Metabolic response 4 years after gastric bypass in a complete cohort with type 2 diabetes mellitus

•Long-term diabetes outcomes after surgery are rarely reported in complete cohorts.•The type 2 diabetes remission rate was 49% at 4 years after gastric bypass.•Remission rates for other metabolic comorbidities were lower than for diabetes.•Long-term surgical or nutritional complications occurred in up to 44% patients. To evaluate the long-term remission rates of type 2 diabetes mellitus and associated comorbidities after gastric bypass surgery in a complete cohort, in a real-life clinic setting. A retrospective study of all consecutive patients with type 2 diabetes mellitus who underwent gastric bypass at a Veterans Affairs Medical Center from 2003 to 2010. The main outcome was remission of type 2 diabetes mellitus defined as HbA1c