The effect of metabolic surgery on nonobese patients (BMI<30 kg/m) with type 2 diabetes: a systematic review.

Background: The influence of metabolic surgery on the glucose and lipid profiles of nonobese body mass index<30 kg/m patients with type 2 diabetes, particularly the effect ≥1 year, remains unknown.

Methods: PubMed and Ovid Embase were used.

Setting: University hospitals.

Results: In total, 21 studies including 921 patients were examined in this systematic review, the results of which revealed decrease in body mass index, waist circumference, fasting plasma glucose, glycosylated hemoglobin A1C, fasting C-peptide, fasting insulin, homeostasis model of assessment for insulin resistance index, triglycerides, total cholesterol, and low-density lipoprotein cholesterol. An increase in high-density lipoprotein cholesterol was also observed. The diabetes remission rates ranged from 13.3% to 90.2% according to 20 studies. The incidence of gastrointestinal bleeding ranged from 1% to 10% according to 9 studies. Four studies reported anemia after Roux-en-Y gastric bypass or one-anastomosis gastric bypass, with the incidence ranging from 8% to 33%.

Conclusions: Nonobese patients can achieve improvements in weight-related indices and glucose and lipid profiles in the short and medium term after metabolic surgery; however, the complications of metabolic surgery warrant further attention.