Bariatric surgery is performed on the stomach or intestine to relief an individual with extreme obesity loses weight. Bariatric surgery is a preference for people who have a body mass index (BMI) above 40. It is also an option for people with a BMI between 35 and 40 who have health problems like type II diabetes or heart disease. Two basic types of bariatric surgeries are there: restrictive surgeries and malabsorptive surgeries. Restrictive surgeries work by physically restricting the size of the stomach and slowing down digestion. Malabsorptive surgery is more offensive surgery in addition to reducing the size of the stomach, remove portions of the digestive tract, interfering with absorption of calories.