For morbid obesity, bariatric surgery is the best possible solution. It puts a band on the stomach so that the person feels full on eating less.
Weight loss is a balance of diet and exercise. Proper diet aids in weight loss. Here's a perfect food pyramid that helps in weight loss.
This quote holds true. Obese people resort to fad diets in order to lose weight and then their weight fluctuates. IT becomes more difficult to lose weight then.