Guide to types of weight-loss surgery

By Mayo Clinic Staff

Weight-loss (bariatric) surgery helps you lose weight and lowers your risk of medical problems associated with obesity. Bariatric surgery contributes to weight loss in two main ways:

  • Restriction. Surgery is used to physically limit the amount of food the stomach can hold, which limits the number of calories you can eat.
  • Malabsorption. Surgery is used to shorten or bypass part of the small intestine, which reduces the amount of calories and nutrients the body absorbs.

Some common types of weight-loss surgery are:

  • Roux-en-Y gastric bypass
  • Sleeve gastrectomy

Roux-en-Y gastric bypass

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In Roux-en-Y gastric bypass, the surgeon creates a small pouch at the top of the stomach. The pouch is the only part of the stomach that receives food. This greatly limits the amount that you can comfortably eat and drink at one time.

The small intestine is then cut a short distance below the main stomach and connected to the new pouch. Food flows directly from the pouch into this part of the intestine. The main part of the stomach, however, continues to make digestive juices. The portion of the intestine still attached to the main stomach is reattached farther down. This allows the digestive juices to flow to the small intestine. Because food now bypasses a portion of the small intestine, fewer nutrients and calories are absorbed.

Sleeve gastrectomy

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In a sleeve gastrectomy, part of the stomach is separated and removed from the body. The remaining section of the stomach is formed into a tubelike structure. This smaller stomach cannot hold as much food. It also produces less of the appetite-regulating hormone ghrelin, which may lessen your desire to eat. However, sleeve gastrectomy does not affect the absorption of calories and nutrients in the intestines.

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Jan. 06, 2022 See more In-depth

See also

  1. Bone health tips
  2. Caffeine: Does it affect blood sugar?
  3. Diabetes prevention: 5 tips for taking control
  4. Medications for type 2 diabetes
  5. Gastric bypass (Roux-en-Y)
  6. Gastric Bypass Complications
  7. Gastric bypass diet
  8. Gastric Bypass Surgery: One Patient's Journey
  9. GLP-1 agonists: Diabetes drugs and weight loss
  10. Hyperinsulinemia: Is it diabetes?
  11. What is insulin resistance? A Mayo Clinic expert explains
  12. BMI and waist circumference calculator
  13. Obesity
  14. Type 2 diabetes
  15. Biliopancreatic diversion with duodenal switch
  16. Roux-en-Y gastric bypass
  17. Sleeve gastrectomy
  18. Weight Loss Surgery Options
  19. Weight-loss surgery