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A sharp knife is a safe knife
there is most likely a period of time when you are using your own fat for energy and this is possible because insulin won't be present in your bloodstream now you might be asking what about those muscle cells they use glucose for energy and that's absolutely true they use energy you eat to move you around all day long the key to the muscle cells however is that they are incredibly efficient and for many people the muscle cells may be full of energy that doesn't get completely used up.