Gastric sleeve surgery is a laparoscopic weight loss procedure that cuts the stomach down into a tube. It looks like a small banana and holds about 2 fluid ounces of food. It resembles a sleeve, and thus the procedure is named the gastric sleeve.This procedure removes part of the stomach which is responsible for ghrelin production. Ghrelin is also called “the hunger hormone”, as it signals hunger to the brain.The new stomach sleeve has much less volume, making it much more difficult to eat large portions. Thanks to the combined effects of less ghrelin and a smaller stomach, gastric sleeve patients can lose a lot of excess weight in a short period of time. , Gastric Sleeve Expected Weight Loss Chart Gastric sleeve surgery is an excellent option if you’ve already been exploring other weight loss methods and you’ve been unsuccessful. Diet and exercise do not often help long-term weight loss, especially if you have many pounds to lose., How much weight can you expect to lose from gastric sleeve surgery? There is an easy way to calculate how much weight you will lose..