Two of those contain impurities that the body will want to flush out. In other words, they’re diuretics.
That said, the effects of caffeine are dramatically overstated. While the coffee may not be as hydrating as water, it isn’t the desiccant many seem to think. If you ingest enough caffeine to lose more water than you take in, odds are Tachycardia will be a bigger issue than dehydration.
Beer: we need 20 water units to expel 1 of alcohol. Beer will just make you pee a lot without hydrating you.
Coffee: forces your body to be awake, you don’t rest and get too tired and then you need more coffee to be active, in a loop. While this happens, your liver is working to remove the caffeine from your blood.
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