Scientists have confirmed that coffee doesn’t dehydrate
Now scientists at the universities of Stirling, Loughborough and Bangor have called for the creation of a “beverage hydration index” to help drinkers understand how different liquids can keep them hydrated. Drinking tea and coffee in normal quantities makes drinkers no more dehydrated than having water, researchers have found, reports the Sunday People.
Tests involving 13 common drinks have found several fluids were retained in the body for the same time, or longer, than water.
One of the lead authors, Dr Stuart Galloway of the Health and Exercise Sciences Research Group at the University of Stirling, said: “We set out to establish how various fluids affect people’s hydration levels on a daily basis.
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“However, we have also bust some myths around dehydration that occurs following ingestion of certain drinks, at least when taken in moderate volumes.”
Professor Neil Walsh, of Bangor University’s school of sport, health and exercise sciences, said: “Many people believe that drinking fluids such as tea and coffee causes them to become dehydrated.
“But we found that when drunk in normal amounts and frequency these drinks do not stimulate any additional fluid loss compared to drinking water.”
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Test participants drank a litre of liquid over half an hour and researchers collected urine output for the next four hours to monitor body salt balance and establish which fluids were retained in the body for longest.
The liquids consumed included still water, fizzy water, milk, cola, hot and cold tea, coffee, lager, orange juice, an oral rehydration solution, and a sports drink.