The intragastric balloon is a device designed to facilitate weight loss of patients with obesity. It is a silicone balloon that, once placed in the stomach under endoscopic guidance, is filled with saline fluid and is left floating free inside the gastric lumen. The balloon decreases sensation of hunger, and promotes saciety. With the help of these two effects, one tries to facilitate carrying out a healthy diet, in order to promote changing previous wrong dietetic habits and reach the goal of weight loss. This is obtained following a nutrititional and psychological programme, which is mandatory to reach the goal and, more important, to maintain the weight loss along time.