Types of Obesity surgeries: Restrictive actions Combined actions (limiting + malabsorption) Absorption practices  
Restrictive surgeries: In these methods, they only cause weight loss by restricting the entry of food into the body.     
Gastric band : In this method, an adjustable silicone ring is placed around the first part of the stomach, slightly below the junction of the esophagus to the stomach, and a reservoir is placed under the skin of the abdominal wall for further adjustments, which is injected from the outside with sterile distilled water. Inside this tank, the ring becomes narrower, thus limiting the amount of incoming food.  
Gastrectomy or gastric sleeve: In this method, which is one of the restrictive methods, after entering the abdomen with laparoscopy, about 80% of the stomach volume is removed with a device that performs cutting and sewing at the same time and is removed from the abdomen. Therefore, by removing the area of the stomach that secretes the hunger hormone (ghrelin), the patient's appetite is normalized and by eating a few tablespoons, fullness and satiety is achieved, and since the above-mentioned hormone acts against insulin, by removing it And its hard decline from a few days after surgery, diabetes begins to control.   
Classic gastric bypass combination surgery: First of all, it refers to combination surgeries that, in addition to reducing and limiting food intake, also have an effect on calorie absorption in the intestines, so it has more weight loss power and slimming will be faster and longer lasting. In addition, due to the effect on both the secretion of hunger hormones from the stomach and anti-insulin from the intestine, they have a greater effect on metabolic syndrome and complications such as diabetes, fatty liver, hyperlipidemia, hypertension, etc.  
Classic gastric bypass: This method is a combination of restrictive and malabsorption methods. In this method, not only the stomach volume is reduced to 15 to 20 cc, part of the intestine is removed from the absorption system and as a result, food absorption is reduced. In this method, the patient loses 90% to 93% of overweight within 24 months, and among the various surgical methods mentioned, it is associated with the highest rate of weight loss and the lowest rate of recurrence (reoverweight).   
Mini Gastric Bypass In the Mini Gastric Bypass method, the small intestine is not cut. In this method, the reduced stomach is connected to 150 to 200 cm of the small intestine. This new bypass method has fewer complications than the old method, but the probability of bile reflux in this method is higher.  
SINGLE ANASTOMOSIS SLEEVE ILEOSTOMY OR SASI : It is a combination of restrictive and malabsorption surgeries.  
SINGLE ANASTOMOSIS DUODENO-ILEAL BYPASS  WITH SLEEVE GASTRECTOMY : It is also a combination of restrictive and malabsorption surgeries.  
Absorption surgery :  Intestinal bypass Duodenal switch