The most frequent question that I get these days is “which weight-loss operation is the best for me?” While there have been many bariatric procedures that have evolved over time, the Roux-en-y gastric bypass and the gastric sleeve seem to have withstood the test of time. In addition, the daVinci robotic technology has improved the technique for achieving these two bariatric procedures. Other weight-loss surgeries have been tried and have either fallen short in expectations over time, or some remain experimental and long-term outcomes are not yet known.

Gastric Sleeve. The sleeve gastrectomy has been around for a long time. It was first introduced as a part of the duodenal switch operation. However, in the past 15 years it has been found to be a good stand-alone operation, resulting in good weight loss. The operation consists of making a tube out of the stomach from the end of the esophagus to the lower portion of the stomach. The tube is narrow, perhaps a little bigger around than your index finger. This tube restricts how much food you can eat. We make it small because it will stretch out over time to be 35-40% the size of a normal stomach, which is what you need to maintain your weight loss. With the gastric sleeve weight loss is rapid at first with most weight loss occurring in the first 6 months. As the sleeve stretches, weight loss slows and is complete at about 1 year. At that point you can expect to lose about 70% of your excess weight. There is also good resolution or improvement in obesity-related illnesses associated with the gastric sleeve. Type II diabetes goes into remission about 60-70% of the time, with medications no longer needed. Hypertension and sleep apnea resolve or improve about 60-65% of the time. In short, the sleeve gastrectomy only restricts how much you eat. The food that is eaten is absorbed properly, so vitamin and mineral deficiencies are uncommon.

Gastric Bypass. The Roux-en-y gastric bypass has also been around for a long time–since the 1960’s. For many bariatric surgeons, the bypass is considered to be the gold standard for weight-loss surgery. The bypass has two parts to the operation. The first part consists of creating a pouch out of the upper part of the stomach which is connected to the esophagus. It too is small–about the size of an adult thumb and can contain about 1-1.5 ounces. It will also stretch to contain about 6-8 ounces over 1 year, allowing you to maintain your weight loss. The second part of the operation is the bypass. The first part of the small intestine is bypassed by connecting the second portion of the small intestine to the pouch. This changes where the bypass portion of the small intestine empties into the second portion of the small bowel. Although it sounds complicated, the end result is a change in how you absorb your food into the intestine. This is called the malabsorptive portion of the operation. The weight loss achieved with the bypass is about the same as the sleeve gastrectomy. Similarly, there is also a favorable impact on obesity-related illnesses. The resolution or improvement seen in hypertension and sleep apnea is about the same for the bypass as it is for the sleeve. However, the change in the anatomy associated with the bypass results in a much better remission rate for type II diabetes. We see resolution in diabetes in about 85% of gastric bypass patients in our practice. The down side of the gastric bypass is that over time it is possible to develop vitamin and mineral deficiencies because of the malabsorptive component. To prevent this from occurring, vitamin and mineral supplements are recommended, and with regular follow-up these deficiencies are uncommon.

So, now to answer the question…”which weight-loss operation is the best for me?” If you have Type II diabetes, the gastric bypass is the best operation for remission and a possible cure. However, if you don’t have type II diabetes, than the sleeve will result in about the same weight loss with a much lower risk of nutritional deficiencies.

And finally, new technology utilizing the daVinci robot has now made the gastric bypass and gastric sleeve a more precise operation. This week I am doing my 100th robotic bariatric procedure and continue to be very pleased with the outcomes, and impressed with the upgrade in technology. The robot provides  a definite improvement over the laparoscopic techniques and I am convinced it results in a better operation. The robot allows for better visualization, giving me a three-dimensional picture so that I have more precise movement of the instruments. This leads to less blood loss, less postoperative pain, and a shorter hospital stay. Presbyterian/St. Luke’s Medical Center is leading this technology in the Rocky Mountain Region. It would be wise for you to consider the use of the robot for your weight-loss surgery.

As always, if we can answer any questions, please don’t hesitate to give us a call (303-861-4505). If you are interested in attending one of our free weight-loss informational seminars, please check our website ( for details. Hope to see you there!

All the best,

Tom Brown, MD

Colorado Bariatric Surgery Institute