Obesity surgery, also termed bariatric or metabolic surgery, comprises operative procedures that treat severe obesity by altering the gastrointestinal tract to limit food intake, modify nutrient absorption, and change gut hormonal signaling. It is generally considered for individuals with high body mass index, or wi…
Obesity surgery, also termed bariatric or metabolic surgery, comprises operative procedures that treat severe obesity by altering the gastrointestinal tract to limit food intake, modify nutrient absorption, and change gut hormonal signaling. It is generally considered for individuals with high body mass index, or with obesity-related conditions such as type 2 diabetes, when nonsurgical measures have not achieved durable results. The principal techniques fall into restrictive procedures, which reduce stomach capacity, malabsorptive procedures, which shorten the functional intestine, and combined approaches. Common operations include sleeve gastrectomy, which removes a large portion of the stomach, Roux-en-Y gastric bypass, and adjustable gastric banding. Beyond mechanical restriction, these procedures produce favorable metabolic and neuroendocrine effects that often improve glycemic control, blood pressure, lipid profiles, and obstructive sleep apnea, frequently before substantial weight loss occurs. Because the surgery permanently changes digestive anatomy and physiology, it carries important risks and long-term consequences, notably micronutrient and vitamin deficiencies that can lead to conditions such as Wernicke encephalopathy from thiamine deficiency, and nutritional challenges that require careful management during pregnancy. Lifelong supplementation, dietary monitoring, and multidisciplinary follow-up are therefore integral to care. As an intervention that links surgical, metabolic, and nutritional medicine, obesity surgery offers significant and sustained benefits for selected patients while demanding ongoing surveillance to prevent complications.
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