Hey Frank, just to add my 2 cents in here, most of the time when people aim for the fastest possible fat loss, they end up failing. The more aggressive the deficit and the more restricted the food list, the more likely the client will be to go off the rails at the first moment of weakness. When you lose fat extremely fast, your leptin tanks and your ghrelin goes sky high. These are your appetite regulation hormones. Leptin signals you that you are full and ghrelin signals that you are hungry. So basically, when you try to do it too quickly, you are in a situation where you are constantly ravenously hungry and when you do eat, you can't perceive when you are full!! NOT a good situation! Also, for people who lose body fat the fastest, they tend to rebound the fastest and gain fat at a rate and magnitude that exceeds their rate and magnitude of loss. I've seen many yo yo dieters end up fatter than they started not long after their crash diet ends. Your best bet for losing fat and keeping it off is a sustained MILD calorie deficit with plenty of protein and fiber, and being mindful of not being overly restrictive. The more sustainable it is, the more likely a client can follow it for long enough to lose fat and keep it off with out the crazy hormonal mess that comes with doing a crash diet. Charles certainly has some awesome rapid fat loss tips, and they absolutely work, but not everyone is a "robot" with the discipline to stay the course through the torturous diet and the hormonal swings. Best of luck to you!