Obesity is best treated with a healthy diet and exercise, but treatments for severe cases of obesity tend to differ. Treatments for severe cases include weight loss medication and weight loss surgery. Medication helps an individual to feel fuller and have less of an appetite, as well as limit the absorption of fat in the stomach. Weight loss surgery or bariatric surgery restricts the amount of food you can eat or stops the absorption of food fats. Bariatric surgery is usually used as a last resort in cases of morbid obesity.