Difference Between Gastric Bypass and Duodenal Switch Surgeries 


Weight loss surgery is getting common these days due to the increase in obesity and obesity-related conditions. But the problem is, many people are confused about which weight loss surgery is best for them. Because they are not aware of the procedure, benefits, complications, or weight loss expectations. Log on to https://bariatricbrooklyn.com/ to know more about weight loss. 

So, let’s provide you with a clear difference between the two most common weight loss surgeries, gastric bypass vs duodenal switch, and tell you which one is best for you in this article. Keep reading….

Differences between gastric bypass and duodenal switch 

Selection criteria:

Both surgeries are used for weight reduction based on your health, BMI (Body Mass Index), and how seriously you can follow the guidelines of the procedure.  

Roux-en-Y Gastric Bypass (RYGB) is used for people with a BMI between 35 to 55 who are on the verge of developing obesity-related diseases. They often have a slower metabolism which doesn’t let them burn more calories at rest and during activity.  

On the other hand, duodenal switch w/Biliopancreatic Diversion is recommended for people with a BMI of 40+ who have an obesity-related disease such as type 2 diabetes, hypertension, sleep apnea, etc. 

Expected Weight loss:

Gastric bypass surgery is the most used weight loss surgery because it has the lowest risks and complications. However, it does not provide the highest expected weight loss. Whereas the duodenal switch provides the highest average weight loss after the surgery but also includes more risks and complications.  


Gastric bypass takes 2 to 3 hours to complete the surgery and the average recovery period is 2 to 3 days. Duodenal switch is a more complicated surgery, so it takes 4 to 5 hours and recovery usually takes 3 to 4 days in the hospital.  


Both surgeries follow a combination of restrictive and malabsorptive mechanisms to induce weight loss. During a gastric bypass, the surgeon shrinks the size of the stomach by creating a small pouch in the upper part of the stomach, which serves as the new stomach. Then, they connect the new stomach directly to the small intestine.  

In comparison, the duodenal switch involves gastric sleeve surgery for reducing the capacity of the stomach. Then, a large part of the small intestine is bypassed or switched from the duodenum and connected to the stomach. This surgery increases the risk of developing nutritional deficiencies. 

Cost of surgery:

Duodenal switch is costlier than gastric bypass surgery due to being a two-step surgery. Although prices can vary in different hospitals and states. In the US, the average cost of a duodenal switch is $25,000 ($23,000-$34,000), while a gastric bypass costs $21,000 ($17,000-$30,000). While in most states, health insurance covers most of the costs of both surgeries.


Pros of gastric bypass 

    • One of the safest and least invasive weight loss surgeries.  
    • Cheaper than other weight loss surgeries.  

Pros of duodenal switch  

    • Provide the highest expected weight loss compared to other weight loss surgeries.  
    • It provides the highest reduction of morbid-obesity complications. 


Duodenal switch tends to have more complications than any other weight loss surgery. However, most of the complications are also present in gastric bypass surgery as well, except for heartburn from GERD (Gastroesophageal Reflux disease). Nutritional deficiency is more severe in duodenal switch than gastric bypass. Other similar complications include:  

  • Excessive bleeding or blood clots.  
  • Infection 
  • Adverse reactions to anesthesia 
  • Dumping syndrome 
  • Ulcers 
  • Gallstones 
  • Leaks in the gastrointestinal system.  

Gastric bypass or Duodenal switch which surgery is best for you? Well, it depends on your condition, if you don’t have obesity-related complications and are ready to follow a restrictive diet, then gastric bypass surgery is for you. But if you have severe obesity and are on the verge of developing obesity-related diseases or have one of them, then the duodenal switch is best for you.  

Want to know more about these surgeries or need a second opinion? Walk in for an appointment at 1797 Pitkin Avenue, Brooklyn, New York 11212. Our bariatric and nutritionist specialists can make effective weight loss plans according to your body’s requirements. Doral Health & Wellness has an advanced bariatric clinic that offers laparoscopic surgeries in bariatrics including Gastric sleeve surgery, Gastric bypass surgery, and Sleeve gastrectomy.  

Call us at 1-347-384-5690 to schedule a consultation.