What shouldn't you drink if you're dehydrated?
Alcohol is fine. So are tea and coffee.
Virtually any fluid will help hydrate you, although you should steer clear of saltwater.
There's no scientific basis for the curious idea that fluids other than water cause dehydration. As a diuretic (something that makes you pass water), caffeine does cause a loss of water, but only a fraction of what you're adding by drinking the coffee. Tea, coffee, squash, and milk are all equally good at replacing fluids.
Ron Maughan, professor of Human Physiology at the University of Aberdeen Medical School, has looked into the effects of alcohol, considered to be another diuretic, and found that, in moderation, it too has little impact on the average person's state of fluid balance.
His results, published in the Journal of Applied Physiology, showed that alcoholic drinks with an alcohol content of less than four percent, such as light beer and lager, can be used to stave off dehydration.
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