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I only drink between 1 litre to 2 litres a day; 2 litres during the warmer weather, but generally it's a litre or just over daily.
My lil sis sent me a piece of info, some years ago, in which it stated that this 2 litre mark for everyone is not necessarily accurate because they don't take people's height etc into the equation; and it stands to reason that a bigger person will need more fluid, but us shorter people may not. Plus, I saw a tv documentary in which they had twins do an experiment for a month; one drank the 2 litres a day, and the other stuck with their normal 500 ml daily intake (which is what both normally drank). At the end of the experiment, neither had increased or decreased levels of fluids in their system, hair samples etc...so in effect the extra water made no significant difference. What people forget is that water is found in a lot of foods as well, so if a person is eating healthy then the veg/fruits etc will have fluid content that people are not adding up....so 2 litres of water on top of that really bumps fluid intake closer to 3 litres without the need to drink extra...
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