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Background  Bariatric surgery is an effective treatment for severe obesity. It also ameliorates diabetes independently of weight loss through mechanisms that are not fully understood. In this study, we investigated the levels of GH, IGF-1 and IGF-binding protein 2 (IGFBP-2) after gastric sleeve surgery in healthy obese individuals.    Method  This study was conducted in 33 obese (BMI > 38.3) healthy male subjects aged 25 to 50 years undergoing sleeve gastrectomy. GH, IGF-1 and IGFBP-2 levels were evaluated by ELISA at baseline and 6–12 months after surgery. Other parameters, such as glucose, BMI, insulin, HOMA-IR and lipid profile, were also investigated.    Results  Systemic GH (12.32 vs. 50.97 pg/mL,  p  < 0.001) and IGFBP-2 levels (51.86 vs. 68.81 pg/mL,  p  < 0.001) were elevated after bariatric surgery. There was no change in IGF-1 level from before to after surgery. BMI (52.18 vs. 40.11,  p =  0.001), insulin (19.35 vs. 8.80 mIU/L,  p  < 0.001) and HOMA-IR index (6.48 to 2.52,  p  < 0.001) were reduced after surgery. Lipid profile analysis revealed that total cholesterol (4.26 vs. 5.12 mmol/L,  p  < 0.001) and high-density lipoprotein (HDL) (0.90 to 1.55 mmol/L,  p  < 0.001) were increased, while triglycerides were decreased, after surgery (1.62 vs. 1.05 mmol/L  p  < 0.001). GH, IGF-1, and IGFBP-2 were not correlated with insulin or lipid parameters.    Conclusions  Our study suggests that improved circulating GH and IGFBP-2 levels may mediate the beneficial effects of gastric sleeve surgery in improving insulin sensitivity and reducing insulin demand.

Effects of gastric sleeve surgery on the serum levels of GH, IGF-1 and IGF-binding protein 2 in healthy obese patients