Actually, there is no RDA for fat, protein, and carbs. That's entirely up to the "user." Some folks swear by low carb, others like more of a balance; some go low fat. These are you marcronutrients; RDA only is set for micronutrients (i.e., vitamins)
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days