If you wanna lose weight do it the healthy way. Eat a well-balanced, low fat (ie healthy) diet, get plenty of exercise, and try to stay as destressed as possible. Not only is this healthier, it is probably more effective and pleasant than starving yourself. Plus, you think eating 400 calories a day is helping you out- guess again. If you get your body used to so little calories, then you get to the weight you want and start eating normally again- you will balloon up. Literally, you will pack on a lot of weight once you quit your 'diet'. You don't want to put yourself into a vicious circle like that.