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Cohort study
At 15 years of follow-up, bariatric surgery, especially when performed within the first year, is associated with diabetes remission and reduced incidence of microvascular and macrovascular complications
  1. Arya M Sharma
  1. Alberta Diabetes Institute, University of Alberta, Edmonton, Canada
  1. Correspondence to: Dr Arya M Sharma, Alberta Diabetes Institute, University of Alberta, Li Ka Shing Building, Rm 1-116, 87th Avenue and 112th Street, Edmonton, Canada, AB T6G 2E1; amsharm{at}

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Bariatric surgery is increasingly recognised as the gold-standard treatment for severe obesity, with long-term studies documenting substantial reduction in overall morbidity and mortality.1 ,2 In addition, an increasing number of short-term and medium-term studies show partial or full remission of type 2 diabetes in about 50% of patients undergoing bariatric surgery, and they also document its superiority in improving glycaemic control compared with conventional medical treatments.3–5 However, the long-term effect of bariatric surgery on the development of microvascular and macrovascular complications remains unknown.


The Swedish Obese Subjects (SOS) study is a prospective, matched cohort study conducted at 25 surgical departments and …

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  • Competing interests None.

  • Provenance and peer review Commissioned; internally peer reviewed.