In this operation, surgeons remove part of your stomach and join the remaining portions together to make a new banana-sized stomach or “sleeve.” With just a small sack (about 1/10th the size of your original stomach), you’ll feel full a lot quicker than you did before. You won’t be able to eat as much as you used to, which helps you lose weight. Plus, the surgery removes the part of your stomach that makes a hormone that boosts your appetite.
Gastric sleeve surgery is best for people who have a BMI (body mass index) of at least 40. That means you’re 100 pounds or more over your ideal weight. Some people are too heavy for gastric bypass surgery, so it may be a good alternative.