Take a listen to that FastTalk episode 37 linked above. I am by no means a scientist, and will not even try to do it justice by repeating the argument they make. But my takeaway was that he made a strong case for why the body shuts down insulin response during workouts, and for about 1 hour after. So taking in carbohydrates while working out hard, that you more than consume in terms of energy shouldn’t be a problem.