Bariatric surgery, also known as weight loss surgery, is a surgical procedure which is performed on dangerously obese patients - the aim is to make them lose weight. The stomach is either reduced in size with a gastric band, or some of it is surgically removed. In some cases gastric bypass surgery is recommended, in which the small intestines are rerouted to a small stomach pouch. After the procedure, the patient's appetite is considerably reduced, also his/her body cannot absorb or digest food as fully as before.
One study showed that bariatric surgery is better than dieting for glucose control.
It is important that you aim for an ideal body weight that is compatible with your height, age and sex. This article may help you decide - "What is my ideal weight?".