Diarrhea is runny because it’s got lots of water in it. That water comes out of you. If you lose lots of water from your body, we say that you are “dehydrated”.
Too dehydrated, and your body has all sorts of problems working and you will get very sick and can even die. So, we put water back in to replace what you’ve lost. By itself, it doesn’t stop diarrhea, but it will prevent the diarrhea from doing too much harm.
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