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Originally Posted by The_Jazz
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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Fat burning vs. muscle burning has nothing to do with ones body fat %, but with exercising intensity, if you go anaerobic (that means your body works with very low levels of oxygen), it is easier for the body to burn glucose than fat, so it breaks down the protein in your muscles in order to create glucose.