Lets set the record straight here and now. Yes right now! Do not workout on an empty stomach. Do NOT workout on an empty stomach. Besides the fact that you will probably get a headache from low blood sugar, if you workout on an empty stomach you may be undoing what you are trying to do in the first place.
Exercise is the catalyst for change, not the change itself. During a high intensity workout your body burns carbohydrates and creatine instead of fat. But, and this is a big but, it stimulates your metabolism, which in turn attacks your fat stores between workouts. It's not the fat burned during the exercise that matters, it's what happens in between that really adds up. Worrying about how much fat you burn during a workout is as pointless as wondering how much muscle your building while working out. (you don't actually build muscle while lifting, you break it down to trigger growth.) So go ahead and have a small snack before a workout, you will need the fuel to make it a worthwhile session.
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