Introduction.

Type 2 diabetes mellitus and obesity are diseases with high prevalence, high morbidity and mortality and high health costs. Bariatric surgery has proven effective in inducing weight loss and adequate glycemic control.

Methods.

Retrospective analytical observational study conducted between 2014 and 2019 in a high-complex institution. Pre-diabetic and diabetic patients undergoing Roux-en-Y gastric bypass or gastric sleeve were included; analyzing the improvement or resolution of diabetes and the loss of excess weight at 6, 12, 24 and 36 months after surgery.

Results.

One-hundred and three patients were included in the study, 45 diabetic patients and 58 pre-diabetic patients. The only perioperative variable with a statistically significant difference was the longer surgical time in the bypass (70 vs. 47.5 min; p<0.001). Loss of excess weight was always greater in bypass. Diabetic patients who underwent bypass had a higher percentage of resolution or control compared to those who underwent the sleeve procedure. In pre-diabetic patients, there was 100% resolution in both groups after 24 months of follow-up.

Conclusion.

Gastric bypass and gastric sleeve present excellent results in terms of weight loss and metabolic control in patients with type 2 diabetes mellitus and pre-diabetes, but superior results in both aspects were achieved with the first technique in our patients.

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