 Gastric bypass is a permanent procedure that helps patients reset hunger and satiety and by altering stomach and small intestine handle the food that is eaten to achieve and maintain weight loss goals.After the surgery, the stomach will be smaller and there will be an increase in baseline satiety hormones, to help the patient will feel full with less food.The gastric bypass had been the most commonly performed operation for weight loss in the United States, and approximately 140,000 gastric bypass procedures were performed in 2005.