What To Expect

You will have some belly pain and may need pain medicine for the first week or so after surgery. The cut that the doctor makes (incision) may be tender and sore. Because the surgery makes your stomach smaller, you will get full more quickly when you eat. Food also may empty into the small intestine too quickly. This is called dumping syndrome. It can cause diarrhea and make you feel faint, shaky, and nauseated. It also can make it hard for your body to get enough nutrition. Having a duodenal switch reduces the risk of dumping syndrome.

Depending on how the surgery was done (open or laparoscopic), you’ll have to watch your activity during recovery. If you had open surgery, avoid heavy lifting or strenuous exercise while you are recovering so that your belly can heal. In this case, you will probably be able to return to work or your normal routine in 4 to 6 weeks.

Eating after surgery

Your doctor will give you specific instructions about what to eat after the surgery. For about the first month after surgery, your stomach can only handle small amounts of soft foods and liquids while you are healing. It is important to try to sip water throughout the day to avoid becoming dehydrated. You may notice that your bowel movements are not regular right after your surgery. This is common. Try to avoid constipation and straining with bowel movements.

Bit by bit, you will be able to add solid foods back into your diet. You must be careful to chew food well and to stop eating when you feel full. This can take some getting used to, because you will feel full after eating much less food than you are used to eating. If you do not chew your food well or do not stop eating soon enough, you may feel discomfort or nausea and may sometimes vomit. If you drink a lot of high calorie liquid such as soda or fruit juice, you may not lose weight. If you continually overeat, your stomach may stretch. If your stomach stretches, you will not benefit from your surgery.

This surgery removes the part of the intestine where many minerals and vitamins are most easily absorbed. Because of this, you may have a deficiency in iron, calcium, magnesium, or vitamins. It’s important to make sure you get enough nutrients in your daily meals to prevent vitamin and mineral deficiencies. You may need to work with a dietitian to plan meals. And you may need to take extra vitamin B12.

How Well It Works

Biliopancreatic diversion surgeries are effective. Most people lose 75% to 80% of their excess weight (the weight above what is considered healthy) and stay at their new weight.^{footnote 1} Ten years after weight loss surgery, many people have gained back 20% to 25% of the weight they lost. The long-term success is highest in people who are realistic about how much weight will be lost, keep appointments with the medical team, follow the recommended eating plan, and are physically active.^{footnote 2}

What To Think About

Weight loss surgery does not remove fatty tissue. It is not cosmetic surgery.

Some studies show that people who have weight-loss surgery are less likely to die from heart problems, diabetes, or cancer compared to obese people who did not have the surgery.^{footnote 3}