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>by the time you feel thirsty, you're already suffering from dehydration,
There's actually no scientific basis for that old wives' tale. Quite a few studies* have shown the opposite to be the case.
*[Phillips, P.A., Rolls, B.J., Ledingham, J.G.G. and Morton, J.J. (1984). Body fluid changes, thirst and drinking in man during free access to water. Physiology and Behavior , 33 , 357-363.] as an example
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