The term Obesity means having too much body mass. When a BMI of 40 or high then it is considered severe obesity. The first cause of obesity is genetics and the second one is when you grow older. One of the prevalent causes of obesity is not sleeping enough which can lead to hormonal changes and may force you to try some high-calorie foods. In addition to this, there are four types of weight loss surgery: Gastric bypass surgery, Gastric sleeve surgery, Laparoscopic adjustable gastric banding, and Biliopancreatic diversion with a duodenal switch.