Changes in insulin sensitivity and secretion after sleeve gastrectomy

Area of Science:

• Metabolic Surgery
• Endocrinology
• Bariatric Procedures

Background:

• Sleeve gastrectomy is a common bariatric procedure for obesity and associated comorbidities like diabetes.
• The precise temporal effects of sleeve gastrectomy on insulin secretion and sensitivity remain incompletely understood.

Purpose of the Study:

• To investigate the dynamic changes in whole-body insulin sensitivity and secretion following sleeve gastrectomy.
• To assess the role of glucagon-like peptide-1 (GLP-1) in mediating these metabolic alterations.

Main Methods:

• Utilized the euglycaemic hyperinsulinaemic clamp technique to measure whole-body insulin sensitivity.
• Employed C-peptide deconvolution after an oral glucose tolerance test (OGTT) to quantify insulin secretion.
• Monitored GLP-1 levels as a marker of incretin response post-OGTT.

Main Results:

• Insulin sensitivity (M-value) significantly increased by 12 months post-surgery (P = 0.015).
• Hepatic insulin resistance, assessed by HOMA-IR, markedly decreased (P < 0.001).
• Total insulin secretion and GLP-1 levels showed significant reductions and increases, respectively (P = 0.011 and P < 0.001).

Conclusions:

• Sleeve gastrectomy enhances insulin sensitivity and modulates insulin secretion within six months.
• While body weight correlates with improved insulin sensitivity, GLP-1 secretion emerges as the principal factor driving these metabolic benefits.