Occasionally surgery is recommended for obesity. The most common types are gastric banding and gastric bypass. They involve reducing the size of the stomach so that you eat less or bypassing part of the gut so that your body absorbs less food. Surgery is recommended for people who have a BMI of 40 and/or a BMI between 35-40 with a disease that could be improved with weight loss (e. g, diabetes or high blood pressure), have tried other suitable ways of losing weight without any success, are fit for surgery and commit to a long-term treatment programme. If you have a BMI of 50 and surgery may be the first option. If your doctor recommends surgery she/he will refer you to a specialist.
Attribution: BUPA