Actually, what is needed to "rebuild worn muscles" is protein. For weight lifting and other "sprint" sports, the glycogen in the muscles are used, but for endurance sports, fat is actually a better fuel.

My position on carbs is that you shouldn't eat more than you burn off. That's all there is to it. If you are strenously exercising, you can burn off the carbs and can have more. And for sports that require a "quick burst" of energy, having glycogen in your muscles is a good thing.

How many on this board are serious athletes? And how many serious athletes have weight problems? This is something that doesn't get addressed. At my present activity level, on Maintenance, 40-60 carbs a day is all I burn, apparently. So that's all I eat. It does make sense.