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mojo - craving carbs and not being hungry after a long run are perfectly normal, especially if you're following one of the popular marathon training models. Generally speaking, your body isn't absorbing any nutrients during periods of anaerobic stress. Actually, that's not technically true since it will absorb SOME, but the rate is way down. For instance, most people only absorb about 4 oz of liquid/hour while exercising. Generally water is a better coolant than anything else, although it can help you maintain hydration if you start out hydrated.
As others have hinted, the amount of food isn't as important as the composition. When I was training hard, I'd sometimes have bizarre cravings, which generally meant that there was some trace element that was running low. I'd usually just answer the craving and it would subside. If you're craving a specific carb, I'd have some.
One other thing - you're not going to start burning muscle mass unless you've burned off most of your body fat. If you're below about 5% body fat now, I'd be worried and see a doctor. If you're over 10%, you're most likely still burning fat since it's the easiest energy production source in the body.
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