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A randomised cross-over trial to evaluate the impact of tea on measures of hydration

Posted date:: 18th Jun '16
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There is a view in the popular press that caffeinated drinks, such as tea, have an adverse effect on hydration.

While studies on caffeine pills have produced inconsistent results¹, those on caffeinated drinks, at caffeine intakes of 114-420mg/d, have found no significant impact on hydration²,³. However, there have been no randomised controlled trials on tea, as consumed.

The present trial aimed to assess the impact of 4 x 240ml mugs of black, i.e. regular tea, on blood and urine measures of hydration. The control condition was a similar volume of boiled water. Four mugs is slightly above average daily tea intakes in the UK.

References

¹Ruxton CHS (2008). Nutr Bull 33, 15-25
²Grandjean AC et al. (2000). J Am Coll Nutr 19, 591-600.
³Fiala KA et al. (2004). Int J Sport Nutr Ex Metab 14, 419-429.

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Facts

“Tea is a natural source of fluoride.”

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