How the surgery works
	The human body lays down fat stores if the calories in the food you eat exceed the energy you burn up. There are a number of complex processes which the medical profession are only just starting to understand which, seem to contribute to increasing obesity - the appetite mechanisms go wrong and you continue to eat even though you do not need the calories. And of course, once your body is carrying the extra weight, it becomes harder to be physically active which is necessary to regulate your weight. Obesity surgery works by helping to reduce the number of calories that are available in your body. There are two ways this can be achieved surgically: Restriction - by reducing the size of the stomach, only small meals can be eaten and the appetite is satisfied Malabsorption by bypassing part of the small intestine, less calories from food are absorbed by the body The operations that work by restriction are: Gastric band Sleeve gastrectomy The operations that work by a combination of restriction and malabsorption are: Gastric Bypass