Differences between weight loss surgeries: Gastric Sleeve and Gastric Bypass

Once you are certain that weight loss surgery is an alternative for you, it becomes a tangled task to determine at first hand the differences between procedures. Even though it is a decision that should be made based on a physician’s evaluation, it is always helpful to learn relevant aspects from each procedure to feel as comfortable as possible with the decision.

According to statistics from the American Society of Metabolic and Bariatric Surgery, the most common procedures in the United States are Gastric Sleeve and Gastric Bypass Surgery.[1] It is crucial to emphasize that there are no right or wrong answers; both are good options but it’s a matter of which one fits you best taking into consideration your medical records. Specially if you have diabetes type 2, reflux disease or/and any type of ulcer history.

Some similarities between both procedures are the reduction of the amount of food you ingest before feeling full or satisfied, 2 days of hospital stay and the fact that both procedures are irreversible.[2] However, there are a few differences you should consider:

  Gastric Bypass Gastric Sleeve
Procedure Reorganize how food flows. A small pouch is attached to the intestine in order to bypass the stomach. You’ll absorb nutrients normally. A portion of the stomach is removed, producing a tube-shaped stomach. You’ll absorb nutrients normally and feel fuller sooner and longer because food should pass through the tube directly to the intestine.
Risks and Complications Risk of dumping syndrome: when food, especially sugar, moves from your stomach into your small bowel too quickly. Lower risk of dumping syndrome: when food, especially sugar, moves from your stomach into your small bowel too quickly.
Expectation of Weight Loss Results 60 to 80 percent of excess weight loss within the first year to year and 6 months. Slower excess weight loss, at a steadier rate. Expected to lose 60 to 70 percent of excess weight in the first 12 to 18 months.
More effective for patients with the following conditions Diabetes and reflux disease.

Generally recommended for patients with a Body Mass Index over 45.


Extensive previous surgery in the middle of the abdomen and ulcer history.


Whether you select gastric bypass or gastric sleeve, it is necessary for you to have frequent checkups and follow a strict post-surgery diet.

If you are considering undergoing any type of weight loss surgery, you can contact us first to learn about your options abroad.


[1] https://asmbs.org/resources/estimate-of-bariatric-surgery-numbers

[2] https://www.upmc.com/services/bariatrics/surgery-process/surgery-options/bypass-vs-sleeve