The Mini Gastric Bypass also known as Single Anastomosis Gastric Bypass (BAGUA) is a procedure that consists of making a small stomach between 10 and 15% of the total volume and connects the distal intestine to that small stomach. This procedure is designed to achieve adequate weight loss and remit associated diseases. The Mini Gastric Bypass acts through 5 mechanisms: 1.- Restriction: This occurs because the stomach is much smaller, this means that the amount of food that can fit in your new stomach is less. 2.- Decreased appetite: This happens because by creating a bypass or "jump" of food, the stimulation of the production of hormones is achieved, specifically GLP-1 and PYY, which are hormones that have, among other functions, early satiety or decreased appetite. 3.- Increased metabolism: The increase or acceleration of cellular metabolism occurs immediately after surgery, this occurs mainly due to the release of the hormones produced in the distal intestine GLP-1 and PYY and the hormones that are produced when food bypasses the first portion of the intestine, GIP. 4.- Increased satiety: Food passes more quickly towards the intestine, this is known as "increased gastric emptying" this occurs due to the pressure generated by the small stomach. The entry of food quickly into the distal intestine causes a negative feedback mechanism to be generated, that is, the body perceives that there is already food in the final part of the intestine "quickly" which causes a significant increase in satiety. 5.- Decreased absorption: The connection that exists between the intestine and the stomach allows food to skip between 1.5 to 3 meters of intestine (the total measurement of the intestine varies between 4 to 7 meters), which decreases absorption total food.