Why is that water is needed to live as opposed to alternative liquids? If coffee is just bean-flavoured water, why couldn’t you survive by only drinking coffee? If you were lost on a desert island and had only coffee, juice or soda to drink, could you survive?
In: Biology
Yes.
Most foods contain some water. Most drinks are mostly water. So while you need… 5 glasses or whatever a day, drinking a coffee counts as one, eating some carrots will have half a glass of water, a sandwich will be have a glass of water, etc etc. You can survive without drinking any actual pure water if you get enough water through other stuff.
BUT. Caffine specifically is a sort of useful poison that your liver, I think, takes extra water to process. So coffee, while being mostly water, also has anti-water. A cup of water would do more to hydrate you than a cup of coffee.
Salt specifically takes a lot of water for your metabolism to process. Which is why drinking ocean salt-water will in fact make you thirstier.
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