The gastric sleeve is an operation where we remove about three-quarters of the stomach. Your stomach goes from a large, expandable stomach to a very narrow, high-pressure tube of a stomach. 

Bariatric surgeons have been doing this operation in the United States for over a decade now. The initial thought was if we reduced the size of your stomach and left behind the part that is not very stretchy, patients wouldn’t be able to eat as much food, which would allow you to lose significant amount weight. However, more research over the last several years has shown us that while there is some restriction involved in this operation, there are other mechanisms at work that help with weight loss. Removing a large portion of the stomach jump starts a metabolic phase where patients’ bodies want to readjust, or reset, how much weight they’re carrying around. 

How the Gastric Sleeve is Performed

The gastric sleeve, otherwise known as the Vertical Sleeve Gastrectomy (VSG) or the sleeve gastrectomy, is a procedure in which the stomach’s size and shape are changed. 

The vertical sleeve gastrectomy involves placing a tube into the stomach along the lesser curve through the mouth. The surgeon will divide the fat attachments along the greater curve of the stomach. Then, using laparoscopic staplers, the surgeon will separate the stomach along the tube, beginning on the lower edge of the stomach (near the pylorus) to the upper edge (near the esophagus). The surgeon will remove about 70 to 80% of the stomach, leaving a banana-shaped pouch. 

Gastric Sleeve

Pros and Cons of the Gastric Sleeve Surgery


The gastric sleeve is an operation where we are only operating on the stomach, and not touching the rest of the small bowel. Therefore, there is no intestinal bypass that goes along with this operation allowing this procedure to be considered less invasive. 

With the gastric sleeve procedure, patients will absorb 100% of what they are eating. This can be a good thing with respect to lowering your risk of vitamin and nutrition deficiencies down the road. However, this can also be problematic because when patients start eating what they shouldn’t be, they are more likely to experience weight regain. 

As it relates to weight loss, the gastric sleeve has historically been looked at as the procedure that results in the lowest amount compared to the other invasive bariatric procedures (gastric sleeve, bypass, and duodenal switch). However, a recent study on the sleeve gastrectomy found that although the gastric bypass resulted in a higher degree of excess weight loss after the first year (72.3% versus 63.7%), “there were no statistically significant differences in excess weight loss after two and five years.”


The gastric sleeve does carry with it a higher re-operation rate due to weight regain or unsuccessful weight loss results. There is an average of a 17% re-operation rate within 5 to 10 years because of weight regain or the development of gastrointestinal reflux or heartburn (aka GERD). Yet, as an advantage, the “percentage of bariatric procedures requiring re-operation due to complications was 15.3 percent for the gastric band, 7.7 percent for gastric bypass and 1.5 percent for sleeve gastrectomy.

At SAMA Bariatrics, we look at re-operations as the last option and will first work with the patient to see if weight gain and GERD can be managed medically. 


The gastric sleeve is an excellent bariatric procedure that results in about 60 to 65% of excess weight loss. Although the weight loss results are not as significant as a more aggressive operation, such as a gastric bypass or duodenal switch, the sleeve can easily be converted down the road should weight regain occur.  

This post was originally published on the Bariatric Centers of America website.