Metabolic Mechanisms in Obesity and Type 2 Diabetes: Insights from Bariatric/Metabolic Surgery
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Updated: Mar 30, 2026

Duodenal-Jejunal Bypass Surgery in Diet-Induced Obese Diabetic Mice
Published on: October 18, 2024
Adriana Florinela Cătoi1, Alina Pârvu, Adriana Mureşan
1Department of Functional Biosciences, Faculty of Medicine, x2018;Iuliu Hax0163;ieganu' University of Medicine and Pharmacy, Cluj-Napoca, Romania.
Abstract:
Obesity and the related diabetes epidemics represent a real concern worldwide. Bariatric/metabolic surgery emerged in last years as a valuable therapeutic option for obesity and related diseases, including type 2 diabetes mellitus (T2DM). The complicated network of mechanisms involved in obesity and T2DM have not completely defined yet. There is still a debate on which would be the first metabolic defect leading to metabolic deterioration: insulin resistance or hyperinsulinemia? Insight into the metabolic effects of bariatric/metabolic surgery has revealed that, beyond weight loss and food restriction, other mechanisms can be activated by the rearrangements of the gastrointestinal tract, such as the incretinic/anti-incretinic system, changes in bile acid composition and flow, and modifications of gut microbiota; all of them possibly involved in the remission of T2DM. The complete elucidation of these mechanisms will lead to a better understanding of the pathogenesis of this disease. Our aim was to review some of the metabolic mechanisms involved in the development of T2DM in obese patients as well as in the remission of this condition in patients submitted to bariatric/metabolic surgery.
Insights
Bariatric surgery aids type 2 diabetes mellitus (T2DM) remission through mechanisms beyond weight loss. Understanding these gastrointestinal changes improves T2DM pathogenesis insights.
Area of Science:
- Metabolic disease
- Gastroenterology
- Endocrinology
Background:
- Obesity and type 2 diabetes mellitus (T2DM) are global health concerns.
- Bariatric/metabolic surgery is an effective treatment for obesity and T2DM.
- The precise metabolic defects causing T2DM and their reversal by surgery are not fully understood.
Purpose of the Study:
- To review metabolic mechanisms in T2DM development in obese patients.
- To explore mechanisms of T2DM remission following bariatric/metabolic surgery.
Main Methods:
- Literature review of metabolic effects of bariatric/metabolic surgery.
- Analysis of mechanisms including incretins, bile acids, and gut microbiota.
- Discussion of the interplay between insulin resistance and hyperinsulinemia.
Main Results:
- Bariatric surgery induces T2DM remission via multiple pathways.
- Mechanisms include altered incretin system, bile acid metabolism, and gut microbiota.
- Weight loss and food restriction are not the sole contributors to T2DM remission.
Conclusions:
- Elucidating surgical mechanisms enhances understanding of T2DM pathogenesis.
- Targeting these metabolic pathways may offer novel therapeutic strategies for T2DM.
- Further research is needed to fully define the role of each mechanism in T2DM remission.
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