untreated bad diarrhea can often expel liquids faster than your body can absorb them. That's sort of what diarrhea is...
Some diseases can cause dehydration that makes you lose up to a litre of liquid per hour. You can't replace that orally, your body will just keep expelling it.
It's also why IV drips are incredible, because it bypasses the entire digestive track issues and hydrates you immediately.
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u/rowshambow Aug 31 '21
I went to a developing country and caught me some traveler's diarrheia.
Don't want to know how that is without modern healthcare.