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Wow, I could never exercise on an empty stomach. My workouts are so hard that I would pass out...lol. I do low carb, which in turn keeps the glucose in my blood low, thus I can eat and still work on only burning fat. My best workouts are M/W/F I weight lift and then hit both the treadmill and bike. The theory is that the weight lifting uses up any excess glucose in the blood and then the cardio can focus only on fat.