I have been trying to find out a definite position either way on this subject... a small amount of physiological info claims that caffeine causes insulin and bloodsugar to go haywire.. but the majority of the info( mostly sports medicine) I have read says that caffeine mobilises fattty acids into the bloodstream, causing the fat to be used as a preferential source of energy, sparing glycogen... meaning.. as far as I can understand... that in the absence of carbs, caffeine will burn fat when you exercise.. anyone have any scientiftic evidence refuting this?