Metabolic Bariatric Surgery
Metabolic Bariatric Surgery
Metabolic Bariatric Surgery (MBS) involves surgical modifications of the gastrointestinal tract to improve health in people living with obesity. These procedures are the most effective medical interventions for obesity, providing long-term improvements in metabolic health, comorbidities, and quality of life, beyond weight reduction alone.
There are several surgical techniques, each with its own indications, potential benefits, and risks. Decisions about which procedure to offer should be made by an experienced bariatric surgeon, following a multidisciplinary evaluation in a specialized center. Unlike non-surgical approaches, the choice of surgery should be individualized from the outset to optimize long-term safety and metabolic outcomes.
Minimally invasive techniques, such as laparoscopy and robotic-assisted surgery, are the current standard of care.
Mechanisms of Surgical Effect
Surgical procedures affect the digestive system in multiple ways, including:
- Restrictive effects (reducing stomach capacity)
- Hypoabsorptive effects (modifying nutrient absorption)
- Metabolic effects (hormonal changes that improve diabetes, appetite regulation, and energy metabolism)
No procedure has purely isolated effects; all types have both restrictive and metabolic components to varying degrees.
Commonly Performed Surgical Techniques
The most widely performed procedures include:
Surgery for Patients with Class IV-V Obesity (BMI ≥ 50 kg/m2)
For individuals with Class IV or V obesity, procedures with more pronounced hypoabsorptive components may be indicated. These surgeries are sometimes performed in one or two stages, beginning with a sleeve gastrectomy.
Many of these procedures preserve the pylorus, the valve controlling stomach emptying, which may help reduce reflux and improve digestion.
These techniques have demonstrated significant metabolic improvements, particularly for type 2 diabetes. However, they are technically complex and may carry a higher risk of nutritional deficiencies, requiring long-term monitoring and support.
Examples include:
Although less commonly performed worldwide (<2%), these procedures remain important options for carefully selected patients.