Analysis of Surgical Treatment for Obesity: How Gastrointestinal Surgery Achieves Weight Loss Goals

Surgical Treatment of Obesity:

Some severely obese patients fail to achieve effective weight loss despite strict diet, exercise, and medication. In such cases, surgical methods may be considered. Surgical treatments for obesity include gastrointestinal bariatric surgery, liposuction, and liposuction. The former, through methods such as small bowel bypass surgery or gastrectomy, creates malabsorption of nutrients or restricts diet to achieve weight loss and alleviate complications. The latter removes locally accumulated fat through resection or liposuction to improve body appearance. While surgical treatments can provide rapid results, complications are common, sometimes serious. Therefore, both doctors and patients should fully understand the procedures and complications of different surgeries and strictly select appropriate surgical methods based on indications.

Gastrointestinal Bariatric Surgery: Gastrointestinal bariatric surgery is primarily used to treat patients with morbid obesity.

Morbid obesity refers to severe obesity characterized by a weight exceeding twice the standard weight, or exceeding normal weight by 45 kg, or a body mass index (BMI) exceeding 40 kg/m², accompanied by complications closely related to obesity. Some obese patients weigh 200% of their standard weight, with a BMI exceeding 50 kg/m², and are termed superobesity. In my country, with improved living conditions, morbid obesity is increasingly prevalent, and its incidence is rapidly rising. Statistics show that approximately 0.5% of children in China are morbidly obese.

Morbid obesity, due to excessive fat accumulation, is often accompanied by various complications, such as hypertension, hypertrophic cardiomyopathy, hyperlipidemia, non-insulin-dependent diabetes mellitus, pulmonary insufficiency, sleep apnea syndrome, gallbladder disease, certain cancers (endometrial cancer, breast cancer, rectal cancer, colon cancer), osteoarthritis, and psychological disorders. Clinical studies have confirmed that in obese patients, weight gain often leads to worsening complications and increased mortality; conversely, weight loss reduces or even eliminates these complications. Weight loss can effectively control cardiovascular risk factors associated with morbid obesity, such as hypertension, diabetes, hyperlipidemia, and pulmonary insufficiency, and can also prolong lifespan. Surgical treatment for obesity aims to effectively reduce weight through surgery to control obesity-related complications.

The etiology of obesity is not yet fully understood. Some obese patients cannot achieve weight loss using medication or dietary therapy, and their obesity symptoms are very severe, requiring symptomatic treatment. Surgical procedures are designed primarily to address the symptoms of obesity. Surgery aims to affect food intake or cause nutrient absorption disorders to achieve weight loss.

Small bowel bypass surgery was a surgical weight loss method developed in the 1960s and 70s. This surgery can cause a comprehensive obstruction of nutrient absorption in the patient, resulting in significant postoperative weight loss. However, it often leads to serious and even life-threatening complications, and therefore is no longer recommended. Currently, the most mature surgical procedures are gastrectomy and gastric bypass surgery. Gastrectomy can restrict total food intake, while gastric bypass surgery both restricts food intake and can induce dumping syndrome. Both are effective for weight loss in clinical applications. In addition, other surgical procedures are being explored, such as pancreaticobiliary bypass surgery and laparoscopic surgery for selective digestive and nutrient absorption disorders.

The suitable age for surgery is generally 18-60 years old. Those under 18 years old are not suitable because their development is not yet complete and their self-control is poor. Obese individuals over 60 years old generally have declining health, reduced social activity, and most patients are not in a hurry for surgery, and the increased surgical risks make them unwilling to undergo the procedure.