A randomised cross-over trial to evaluate the impact of tea on measures of hydration
- Posted: 17 June 2010
- Categroy: TAP Reports
- Download:
433 KB pdf
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 hydration. 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.
Please download the document above to read the full report.
Myth Buster
“Is the high level of fluoride in tea harmful?”
No, fluoride is known to protect teeth from dental caries. The tea plant accumulates fluoride from the soil and for this reason a cup of tea is a natural source of fluoride.
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