This is a big question for me. So RNY (bypass) is what most people think of when they think of bariatric surgery. It's redoing the plumbing so that some calories are not absorbed (bypassing the stomach) and attaching a small pouch to the intestines so you can eat less. It's considered the "gold standard" in weight loss surgery. The sleeve (Vertical Sleeve Gastrectomy) or VSG is reducing the size of the stomach (and removing 80% of it) making it the size of a small banana. This, of course, reduces the amount of food you can eat and prompts hormonal changes that aid in losing weight. (See drawing below) There are benefits and drawbacks for each. The drawback for the bypass is there are some people who have absorption issues and some have issues with dumping (sweats, diarrhea, vomiting, nausea). The benefit is that you lose slightly more weight with the bypass (50-80% on average of excess weight). The sleeve has the drawback of increased reflux and is not as effe...