Not necessarily the "diet" either, Bo. When did you eat the carbs before your workout? It's possible that the timing was wrong, and that could have what cause you to fatigue quickly (a fast drop in blood glucose brought on by an insulin spike that was timed poorly with exercise).
I can't imagine physiologically how any acute diet would CAUSE "chest pains". I agree with Danny about metabolizing fat, but one of the problems inherent with "Adam's Diet" is that you restrict carbs but you never completely convert to using fat as your primary source of energy (which would be ketosis). I've been eating low-carb for a while, so it doesn't bother me (maybe my body has adjusted), but I'm not sure about going straight from an average diet to "Adam's Diet". (But as Danny said, maybe you need some time to adjust.) JP might be able to elucidate us on his experience.
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