NIH-established indications for bariatric surgery were set close to three decades ago. The purpose of this study was to evaluate outcomes in patients undergoing bariatric surgery with Class I obesity, a class that does not fall into current indications.


De-identified electronic health records from a clinic system's Electronic Health Record database were accessed to identify adult patients undergoing Roux-en-Y gastric bypass (RYGB)(n=566) and Sleeve gastrectomy (SG)(n=730). Patients were compared in terms of resolution of co-morbidities and weight loss outcomes at three years following surgery. A mixed effects model was used, adjusting for the type of surgery, the number of quarters after the surgery when the averaged measurements were taken, and the interaction between these two variables.


Patients lost up to 20% of their initial BMI. Being of younger age, female, and having an obesity-related comorbidity were associated with greater weight loss. At around two years after the surgery, the likelihood of being in remission from type 2 diabetes reached 45%. Remission probabilities for hypertension are 60% for RYGB and 50% for SG, three years after the surgery. On the other hand, the probabilities of remission from hyperlipidemia are close to 50% and 25% for RYGB and SG at two years. There was no difference between the BMI trajectories and remission from T2D when comparing the two groups.


Bariatric surgery is effective in weight loss and resolution of comorbidities in patients with Class I Obesity. This data further supports the need to update the current indication criteria.