You can't really burn muscle so to speak, but you can burn it in the sense that their is rapid muscle depletion. When your body becomes dangerously low on fats, carbs, and proteins, it will have to start drawing nutrients away from your muscle. Your muscle will stop growing and lose the abilitiy to repair itself when it becomes torn. This is a very extreme scenario though, and very few people "burn" muscle unless they starve themselves and do regular HIW's.
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