RNY (Roux-en-Y) gastric bypass and the gastric sleeve (sleeve gastrectomy) are two of the most common bariatric surgeries. While both procedures restrict the stomach’s size, the RNY bypass also reroutes part of the small intestine, reducing calorie absorption. The sleeve removes a large portion of the stomach without altering the intestines. The choice between the two depends on the patient’s health, goals, and surgeon recommendations.