Bariatric surgery or obesity surgery are the surgical procedures that is performed on the patients who cannot lose weight despite dietary restrictions or other treatments and whose body mass index (BMI) is higher than 40; or on patients whose BMI is higher than 35 and have chronic illnesses and therefore suffer from significant physical health problems. These surgical procedures play an important role in the treatment of obesity by helping people to return to their normal weight, thus eliminating the health problems that had arisen due to unhealthy weight gain.