fast
weight loss is most of the time lost water and muscles. Fat takes ages to go away.
Third: Think of a diet as something permanent. Crash diets just help you gain weight faster once they are over. So, pick some simple rules of a balanced and healthy diet, and follow them. Don't sweat it if you crave for something "bad", to a balanced diet belongs the bad side, too. If you give in now to a small piece of chocolate, it is much better than to eat two whole packages later.