Nothing of the sorts. I don't mean to sacrifice anything and cheat days are very beneficial, for the weight loss and motivation. I just mean put better fuel in the machine and it will be much more productive for a longer period of time. I don't mean crash diets of any kind.. Anytime you lose mass amounts of weight quickly something is wrong. You can pretty much fast by not taking enough calories, or cutting carbs. The weight will fall off for a while!!! I repeat for a while... But it's not healthy, thinking long term here.

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You come into the world weak, and you will leave the world weak. What you do in between is up to you!