Ok, I'm doing some more searching on the net. This link says "When losing weight through calorie reduction alone, a person loses 25% of his or her lean body mass and 75% of his or her body fat."

And another site that basically says the same thing. However this one also says "as you continue to lose weight, especially if certain types of exercise are included in your weight loss plan, fat loss should be about 90 percent of the weight you lose and lean body mass should be about 10 percent."

Maybe we could use this info to run our calculations?