I remember a show i watched long ago, the person giving the lecture said that if you were breathing hard then you were burning sugar and adrenaline and if you could talk to the person beside you with out panting, talk easily, then it was likely you were burning fat. i ttakes time for the fat to get read and get to where it is going and sugar is a faster fuel.
I am not sure if this is still valid, i imagine there has been all kinds of study gone into it since that show.
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