Our expert says:
Well, burning fat means burning calories, so it's actually self-defeating to try to separate them. It doesn't matter much whether you're burning those calories from fat or other sources, like carbs, the important thing is that you're burning them. So for example, 40 minutes of exercise might burn 600 Calories, of which 300 are from fat and 300 from Carbs. That's all that really counts, because your diet then replaces the calories, and if that doesn't complement the training, then you could just as well burn 600 calories from fat and you still wouldn't lose weight.
It's a very complex situation, and I hate to give you an essay to read, but I wrote a piece on this once before, on my own site, and I think it would clear up some of the confusion:
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