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Message: <blockquote data-quote="Dark Horse" data-source="post: 1121265" data-attributes="member: 52527">MYTH 1: "We need to drink at least 8 glasses of water per day."- It is thought that this myth arose when scientists wrote that people need around 2.5 litres of water per day. Although the text was clear that most of this water is contained in food, somehow that message got lost and people interpreted the advice to mean that people needed to drink 2.5 litres per day. The amount people need to drink varies depending factors such as what they eat and whether they are sweating a lot.MYTH 2 : "By the time you feel thirsty, you are already seriously dehydrated."- There may be a few exceptions (e.g. an elderly person with dementia) but in general thirst is the best guide to when you should drink fluids. Millions of years of evolution have resulted in a very sensitive system for keeping body fluids balanced and any degree of dehydration at the time you first feel thirsty is trivial.MYTH 3: "Drinking coffee won't rehydrate you because it contains caffeine which is a diuretic."- Although caffeine is indeed a diuretic, the diuretic effect of the small dose contained in a cup of coffee is far outweighed by the rehydrating effect of the large volume of water contained in the coffee.</blockquote>

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