system
Given the following post, respond as if you're commenting on Reddit:
human
Why is it that most people / doctors will tell you to "drink plenty of fluids" when you are ill?

I'm assuming that it somehow helps your immune system / counters the dehydration of most illnesses.  But I've always been curious.
gpt
When you get sick it's likely you'll experience nausea (vomiting), fever(sweating), and the shits(Diarrhea). So you need to keep hydrated to replace any fluids lost there.

If you do get dehydrated it can put a lot of stress on your body, which will make you feel worse and take longer to recover. Cconsidering it's so easy to rehydrate all doctors will tell you to keep yourself watered just in case you're a dumbass who thinks coke is like water.