Please note: This information was current at the time of publication. But medical information is always changing, and some information given here may be out of date. For regularly updated information on a variety of health topics, please visit, the AAFP patient education website.

Information from Your Family Doctor

Weight Loss Surgery


Am Fam Physician. 2016 Jan 1;93(1):online.

  See related article on bariatric surgery

What is weight loss surgery?

Weight loss surgery (also called bariatric or metabolic surgery) makes the stomach smaller and changes the hormones that signal hunger. The three most common surgeries are gastric banding, sleeve gastrectomy, and Roux-en-Y (ROO-en-Y) gastric bypass. The goal of these surgeries is for you to feel full with less food, so you eat less and lose weight.

What is gastric banding?

A silicone band is placed around the upper part of the stomach so that less food can be eaten at once (Drawing 1). Your doctor can adjust the band after the surgery to control weight loss.

Drawing 1.

Adjustable gastric banding.

Drawing 1.

Adjustable gastric banding.

What is sleeve gastrectomy?

Part of the stomach is removed, creating a long tubelike structure that reduces the amount of food that can be eaten (Drawing 2). Hormones that signal hunger are decreased.

Drawing 2.

Laparoscopic sleeve gastrectomy.

Drawing 2.

Laparoscopic sleeve gastrectomy.

What is Roux-en-Y gastric bypass?

A small pouch is created so that food “skips” the rest of the stomach and some of the small intestine (Drawing 3). After this surgery, the stomach (pouch) is smaller, the body absorbs fewer calories from food, and hormones that signal hunger are decreased. These changes lead to weight loss.

Drawing 3.

(A) Stomach before bariatric surgery, and (B) after Roux-en-Y gastric bypass.

Drawing 3.

(A) Stomach before bariatric surgery, and (B) after Roux-en-Y gastric bypass.

Who can have weight loss surgery?

People with a body mass index (BMI) of 40 or higher, or people with a BMI of 35 who have at least one weight-related medical problem are usually eligible for weight loss surgery if they have not been able to lose weight in other ways.

Will I be able to eat normal foods after the surgery?

There are strict food recommendations that need to be followed after weight loss surgery. You will never be able to eat the way you used to, but you also will not be as hungry as you used to be.

Will my insurance pay for weight loss surgery?

Many insurance plans cover weight loss surgery. Check with your insurance provider for details about your plan.

Where can I get more information?

Your doctor

American Society for Metabolic and Bariatric Surgery

National Institutes of Health

Obesity Action Coalition

This handout is provided to you by your family doctor and the American Academy of Family Physicians. Other health-related information is available from the AAFP online at

This information provides a general overview and may not apply to everyone. Talk to your family doctor to find out if this information applies to you and to get more information on this subject.


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Mar 1, 2021

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