From: Roger Greenway, ENN
Published January 10, 2014 07:41 AM

Coffee and hydration

I sometimes feel like I should be drinking more water. After all, look at all those people drinking bottled water! I usually go for coffee! Either strong black or perhaps a nice Cappuccino. I just love it, and my doctor told me at one point that it was a ok way to get hydrated, as long as it didn't give me the jitters or cause sleep problems (it never does and I can drink regular coffee after an evening meal and have no trouble going to sleep. 

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New research(1), published today in the PLOS ONE, has found no evidence for a link between moderate coffee consumption and dehydration. The research, conducted by researchers at the University of Birmingham School of Sport and Exercise Sciences, UK, found that drinking moderate amounts of coffee does not result in dehydration and contributes to daily fluid requirements in regular coffee drinkers just as other fluids do.

Due to early research showing the acute effects of caffeine as a mild diuretic, there appears to be a common assumption that caffeinated beverages, such as coffee also have this effect.

However, the effect of coffee consumption on fluid balance cannot be directly compared with that of pure caffeine. Interestingly, prior to publication of this new study only two studies had specifically investigated the effects of caffeine in the form of coffee on hydration status(3,4) with mixed and inconclusive results.

This is the first study to directly assess the effects of a moderate consumption of coffee compared to equal volumes of water. Sophie Killer a Doctoral researcher and lead author of the study commented: "Despite a lack of scientific evidence, it is a common belief that coffee consumption can lead to dehydration and should be avoided, or reduced, in order to maintain a healthy fluid balance. Our research aimed to establish if regular coffee consumption, under normal living conditions, is detrimental to the drinker's hydration status."

In a sample of regular coffee drinkers, Killer and colleagues measured the effects of moderate consumption of black coffee compared to the consumption of equal volumes of water on fluid balance and hydration status. Fifty male participants were tested in two phases, where they were required to drink four mugs (200ml) of either black coffee or water per day for three days. In the second phase, those who had initially drunk coffee switched to water and vice versa. The two phases were separated by a ten day 'wash out' period.

"We found that consumption of a moderate intake of coffee, four cups per day, in regular coffee drinking males, caused no significant differences across a wide range of hydration indicators compared to the consumption of equal amounts of water," said Sophie Killer. "We conclude that advice provided in the public health domain, regarding coffee and dehydration, should be updated to reflect these findings."

Sunday morning coffee image via Shutterstock.

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