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asked 10 months ago
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Caffeine dehydrates the body because it is a Diruretic, that means that it pushes the fluid through the body quickly, unlike water it nourishes the body tissues and hydrates us. Cofee and tea are both diruretics.
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Caffeine causes activation of our sympathetic nervous system, just like epinephrine & similar chemicals. Caffeine causes our blood vessels to constrict, blood pressure to increase and our heart to beat faster. This results to increase in cardiac output. Increase in cardiac output results to increasing renal filtration, which results to increase in urine output, and therefore dehydration, if there is imbalance in intake and output of fluids.
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Research does not back up the claim that caffeine is a diuretic. In fact when consumed as a beverage, ie in coffee, it is no more a diuretic than water. Have a look here for the evidence
http://www.brighthub.com/health/diet-nutrition/articles/22963.aspx
http://www.brighthub.com/health/diet-nutrition/articles/22963.aspx
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