There are far better more enjoyable ways of losing weight than that. Surely if you lose the weight, you don't actually want to put it all back on again. Which is what will happen if you go on a diet like this, because when you're finished with it, you're back to eating as you did before, so the weight will come back. If you want to lose weight an keep it off, you need to have a diet which is healthy, an enjoyable, so you can eat like that permanently.