Hi, I just read Burn the Fat, Feed the Muscle, and Tony Venuto says this:
If fat loss is your number one goal and you want to achieve it the healthy way without losing muscle or energy, then you can't go wrong with 50-55% carbohydrates, 30% protein and 15-20% fat as your starting point. These numbers are not intended as a rigid prescription; for fast metabolism types, 55% carbohydrates or the classic 60% carbohydrates works well. For others, 45% carbohydrates is a better place to start. Your ratios might need to be adjusted slightly depending on your body type. But before you can make any adjustments for your body type and goals, you must first establish a starting point or "baseline."
So he suggests starting with the first numbers, charting your success, and making adjustments until you find what's right for you. He says that although lots of people are the same, many people are different and will require lower/higher carbs than others. So although I know it's annoying, starting with 50-55/30/15-20 and then finding what's right for you will do the trick! Oh, and he also suggests zig-zagging your calories - 3 days at your weight loss calories, 1 day at maintenance.