my understanding is that we need water to break down food molecules (helping the liver run smoothly) so drinking tea, with no sugar or milk is the same as drinking water, but as soon as you drink something that needs to be broken down like artificical sweeteners, sugar, milk, alcohol blah blah blah, instead of just rehydrating your body you are using up some of the water you're drinking just to break down those molecules. And we need water to dilute our blood and help the liver and kidneys to function correctly etc.
This is just what I remember from A-Level biology. Makes sense though.
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