Gastric bypass surgery is a form of weight-loss surgery in which the stomach is made smaller and food is re-routed away from some parts of the stomach and small intestine in order to keep it from being absorbed by the body. The procedure may be performed using a traditional, “open” surgical approach or via laparoscopic (minimally invasive) method. This surgery is reserved for patients who suffer from severe obesity (BMI of 40 or above) and those with obesity and related health conditions such as diabetes or heart disease who have been unable to achieve the needed amount of weight loss through diet and exercise alone. Patients should be aware that following the surgery, they will have to adjust their lifestyle so that they consume smaller portions, receive appropriate nutrients and exercise regularly. Patients who receive gastric bypass surgery are typically able to lose 10 or more pounds per month in the year following their surgery.