The doctor will insert an endoscope, which is a flexible tube with a camera and a suturing device, down your throat and into your stomach. The tiny camera captures a detailed image of the inside of your stomach, eliminating the need for any abdominal incisions. Using the endoscope, about 12 sutures are made in your stomach to transform the shape into a narrow tube. The new, smaller stomach reduces the amount of food that you can eat and the quantity of calories that your body can absorb. ESG is done under general anesthesia and takes approximately an hour and a half.