They just make you want to drink more because of the sugar. The report (linked above) doesn't mention anything about the existing caffeine consumption habits o

They just make you want to drink more because of the sugar. The report (linked above) doesn't mention anything about the existing caffeine consumption habits of those in the experiment. I think that unless they controlled for that, it could possibly skew the experiment one way or another. Also, one possibility regarding the lower reaction time in the high caffeine group is that they feel jumpier and attempt to compensate for the increased jitteriness by slowing down a bit. I know that this was suppose to be a blind test, but if they gave me this test... I could probably tell the difference.