Roux-en-Y Gastric Bypass Surgery (RNY)


Roux-en-Y gastric bypass (RNY) surgery was developed in the late 1960s and is one of the most commonly performed surgical weight-loss procedures in the U.S. The technique involves dividing the stomach into 2 parts so that food only passes through a small pouch and bypasses the remaining larger pouch. With a long history of safety and proven track record, gastric bypass is often considered the gold standard of weight loss surgery.

At The University of Kansas Health System, we offer Roux-en-Y gastric bypass surgery as a weight loss solution to help you improve your health. To find out if gastric bypass is right for you, schedule an appointment by calling 913-588-1227 or request your appointment online. The University of Kansas Health System offers gastric bypass surgery for patients in Kansas City, Overland Park and surrounding areas.

What is Roux-en-Y gastric bypass surgery?

Roux-en-Y gastric bypass surgery is a procedure that reduces your upper stomach to the size a golf ball. This small pouch is surgically redirected to part of the small intestine, and the food you eat bypasses the remaining part of your stomach and upper part of your small intestine. The reduced capacity of the stomach helps you feel less hungry, eat less food and feel full more quickly. The feeling of fullness also lasts longer because the reduced size of the stomach outlet (also called stoma) delays the food in emptying the stomach.

Those who have gastric bypass surgery consume fewer calories. Calorie and nutrient absorption is also reduced since the food bypasses a large portion of the intestines, leading to weight loss. The procedure affects hormones in the gut that increase satiety and reverse obesity-induced insulin resistance.

Gastric bypass surgery pros and cons


  • Most-researched
  • Rapid weight loss
  • Highly effective for resolving diabetes 


  • Dumping syndrome
  • Possible nutritional deficiencies 
  • Requires intestinal rerouting

Benefits of gastric bypass surgery

Gastric bypass surgery is a highly reliable weight-loss surgery. Most patients can expect to lose between 65-80% of their excess body weight within the first 2 years of surgery. Long-term success depends upon a balance of nutritional intake and exercise. Maintaining this weight-loss requires permanent lifestyle changes.

Weight-loss with gastric bypass surgery is also more rapid than with other techniques, such as gastric adjustable banding, because it combines both restriction (reducing the size of the stomach) and malabsorption (bypassing a large portion of the stomach). In addition, gastric bypass surgery can help you:

  • Improve or eliminate type 2 diabetes
  • Improve blood pressure and/or cholesterol
  • Reduce the amount of sugar and carbs in your diet (too much creates dumping syndrome)
  • Exercise more comfortably and easily as a result of dramatic weight-loss


Why choose us

Weight loss surgery isn’t simply about losing weight. It’s about improving your health and changing your way of life. The University of Kansas Health System provides a network of support services to help you lose weight and improve your health for good. From nutritional counseling and support groups to insurance coordination, we’ll be with you every step of the way to make your experience as comfortable as possible.

Our experienced, board-certified team of bariatric surgeons are experts in their fields. Together, they have performed more than 1,650 bariatric surgeries since 2002. With their expertise, you can trust that you are receiving a safe procedure using the most up-to-date surgical techniques. Our surgeons specialize in minimally invasive surgery to help you recover faster and easier.

What to expect

Gastric bypass surgery is an inpatient procedure that is performed using general anesthesia. During surgery, your surgeon will use minimally invasive, specialized instruments to perform your operation. This will reduce your hospital stay from 5-7 days (as with an open procedure) to 2 days.

After your surgery, you will be taken to a recovery room. Your surgeon will speak to your family and let them know the outcome of your surgery. You will have a nurse at your side the entire time you are in recovery.

Once you are released, you will need to follow a strict diet that includes only clear liquids for the first week. Eventually, over the course of about 6 weeks, you will transition to solid foods again. You will be provided with sample meal plans to help you during this phase of your recovery. It’s recommended that you journal or write down what you are consuming during this time to ensure you are meeting your nutritional requirements.

Roux-en-Y gastric bypass surgery often leads to long-term weight-loss of up to 60-80%. Your final results will appear over the course of about 2 years. Improvements in weight-related conditions, such as hypertension or diabetes, can also occur during this time.

Risks and complications

A small percentage of people who have Roux-en-Y gastric bypass surgery may experience complications. One complication includes long-term deficiencies in vitamin B12, calcium and folate. A strict compliance with your physician and healthcare team’s recommended diet and vitamin supplementation after the surgery is very important.

Need help making an appointment?

Call 913-588-1227 or request an appointment online.