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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