Roux-en-Y gastric bypass is a surgery for
obesity. It changes the stomach and small intestine to cause weight loss by:
- Restricting food intake—creates a small pouch to serve as the stomach, so you cannot eat as much
- Making the body unable to absorb as many calories from the food—bypasses the first part of the small intestine, where many of the calories from food are usually absorbed
Reasons for Procedure
The surgery treats severe obesity. A calculation called body mass index (
BMI) is used to determine how overweight or obese you are. A normal BMI is 18.5-25.
Roux-en-Y gastric bypass is a weight loss option for people with:
- BMI greater than 40
- BMI 35-39.9 and a life-threatening condition or severe physical limitations that affect employment, movement, and family life
The success of gastric bypass surgery depends on your commitment to lifelong health habits. If lifestyle changes are made and maintained, the benefits of bariatric surgery include:
- Long-term weight reduction
- Improvement in many obesity-related conditions
- Improved movement and stamina
- Enhanced mood, self-esteem, and quality of life
Problems from the procedure are rare, but all procedures have some risk. Your doctor will review potential problems, like:
- Blood clots
- Bowel obstruction
- Breakdown of the staples, allowing leakage of stomach juices into the abdomen
- Diarrhea, abdominal cramping, and vomiting
Dumping syndrome—This occurs after eating sweets, when food moves too quickly through the small intestine causing sweating, fatigue, lightheadedness, cramping, and
- Complications of general anesthesia
Before your procedure, talk to your doctor about ways to manage factors that may increase your risk of complications such as:
Chronic disease such as
What to Expect
Each bariatric surgery program has specific requirements. Your program will likely include the following:
- Thorough physical exam and review of medical history
- Ongoing consultations with a registered dietitian
- Mental health evaluation and counseling
Leading up to your procedure:
- Talk to your doctor about your medications, herbs, and dietary supplements. You may be asked to stop taking some medications up to one week before the procedure.
- Do not start taking any new medications, herbs, or supplements without talking to your doctor.
- Arrange for a ride to and from the hospital.
- Arrange for help at home as you recover.
- You may be asked to take antibiotics before coming to the hospital.
- You may be asked to take laxatives and/or do an enema to clear your intestines.
- The night before your surgery, eat a light meal. Do not eat or drink anything after midnight unless told otherwise by your doctor.
- Shower or bathe the morning of your surgery.
To prepare you for surgery, an IV will be placed in your arm. You will receive fluids and medications through this line during the procedure. A breathing tube will be placed through your mouth and into your throat. This will help you breathe during surgery. You will also have a catheter placed in your bladder to drain urine.
An 8-10 inch incision will be made to open the abdomen. Surgical staples will be used to create a small pouch at the top of your stomach. This pouch, which can hold about 1 cup of food, will be your new, smaller stomach. A normal stomach can hold 4-6 cups of food.
Next, the small intestine will be cut and attached to the new pouch. With the intestinal bypass, food will now move from the new stomach pouch to the middle section of the small intestine. It will skip the lower stomach and the upper section of the small intestine.
Finally, the upper section of the small intestine will be attached to the middle section of the small intestine. This will allow fluid that the lower stomach makes to move down the upper section of the small intestine and into the middle section.
When the bypass is completed, the incisions will be closed with staples or stitches.
Roux-en-Y Gastric Bypass
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You will be taken to the recovery area for monitoring. You will also be given pain medication.
Anesthesia will prevent pain during surgery. Pain and discomfort after the procedure can be managed with medications.
The usual length of stay is 2-5 days. Your doctor may choose to keep you longer if complications arise.
While you are recovering at the hospital, you may receive the following care:
During your stay, the hospital staff will take steps to reduce your chance of infection such as:
- Washing their hands
- Wearing gloves or masks
- Keeping your incisions covered
There are also steps you can take to reduce your chance of infection such as:
- Washing your hands often and reminding visitors and healthcare providers to do the same
- Reminding your healthcare providers to wear gloves or masks
- Not allowing others to touch your incision
You will need to practice lifelong healthy eating and exercising habits. Keep in mind after your surgery:
- Do not lift anything heavy until your doctor tells you it is safe. This may be up 2 weeks or more.
- You may have emotional changes after this surgery. Your doctor may refer you to a therapist.
Your new stomach is the size of a small egg. It is slow to empty, causing you to feel full quickly. Therefore, you need to eat very small amounts and eat very slowly:
- You will begin with 4-6 meals per day. A meal is two ounces of food.
- For the first 4-6 weeks after surgery, all food must be pureed.
- When you move to solid foods, they must be chewed well.
- When making food choices, you will need to consume enough protein.
- Avoid sweets and fatty foods.
- Eating too much or too quickly can cause vomiting or intense pain under your breastbone. Most people quickly learn how much food they can eat.
Call Your Doctor
Contact your doctor if your recovery is not progressing as expected or you develop complications such as:
- Signs of infection, including fever and chills
- Redness, swelling, increasing pain, excessive bleeding, or discharge from the incision site
cough, shortness of breath, or chest pain
- Worsening abdominal pain
- Blood in the stool
- Pain, burning, urgency or frequency of urination, or persistent bleeding in the urine
- Persistent nausea or vomiting
- Pain or swelling in your feet, calves or legs
- New or unexpected symptoms
If you think you have an emergency, call for emergency medical services right away.
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Survival among high-risk patients after bariatric surgery.
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9/2/2009 DynaMed Plus Systematic Literature Surveillance
http://www.dynamed.com/topics/dmp~AN~T483434/Bariatric-surgery: The Longitudinal Assessment of Bariatric Surgery (LABS) Consortium. Perioperative safety in the longitudinal assessment of bariatric surgery. N Engl J Med. 2009;361(5):445-454.
6/24/2011 DynaMed Plus Systematic Literature Surveillance
http://www.dynamed.com/topics/dmp~AN~T483434/Bariatric-surgery: Pontiroli AE, Morabito A. Long-term prevention of mortality in morbid obesity through bariatric surgery. a systematic review and meta-analysis of trials performed with gastric banding and gastric bypass. Ann Surg. 2011;253(3):484-487.
Last reviewed December 2017 by
EBSCO Medical Review Board Marcin Chwistek, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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