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Of the many problems with soda, caffeine is not one of them. Look how many athletes take caffeine before a competition to amp themselves up. If caffeine was such a diuretic, then the loss of water would far outweigh the gain in performance adge. The whole diuretic caffeine thing has been blown way out of proportion. Soda will rehydrate you, but the high level of sugar in it will slow absorption from the stomach. A small amount of sugar speeds up absorption. That is one reason why gatorade has a small amount of sugar.
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