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Whenever I drink a Red Bull or a Monster Energy drink it does nothing to me. All that caffeine just filters out my system. Yet for some reason, a single can of Diet Coke or Dr. Pepper is enough to keep me up well into the night. What gives? I mean, I usually have to use the bathroom shortly after drinking energy drinks, but am I really overloading my system so much that I have to literally shit / piss the caffeine out?