I know many people on this subforum are in the Calories/Calories Out fat loss ideology. So I pose a question: Person A eats 1500 calories (his maintenance calorie rate is 2000) but eats at a ratio of 80 percent carbs, 10 percent protein, 10 percent fat. Person B eats 1500 calories (maintenance 2000) but eats at a ratio of 45 percent protein, 25 carbs, 30 percent fat. They both exercise 3-4x a week with moderate intensity. All other conditions are the same. Will one or the other lose more weight, or will they lose equal amounts of weight and why? What about muscle mass? Will Person A lose muscle mass due to his diet? I just want to see the specifics of our members' opinions on the calorie in/out equation.