A few decades ago, weight loss surgery was new and relatively unknown. Most patients who had this type of procedure had what was known as a gastric bypass, in which the intestinal connection to the stomach was moved, bypassing the majority of the stomach. Now, weight loss surgery is more common, and there are a number of procedures to choose from. One of them is called the gastric sleeve procedure. While gastric sleeve surgery is a great choice for many patients, it is not for everyone.