Basically, your body is trying to flush out all physical waste and liquid stored up in the body because it’s trying to expel the potential cause of it. That’s why people with food poisoning often throw up and have diarrhea. Your body is trying to force the bad food and chemicals in your system out as fast as possible. It will be better for the body to recover without the excess, than to allow the excess to fully digest and make things even worse.
This is why people throw up when they drink too much. The body is trying to remove the excess toxins, alcohol being classified as an actual Neurotoxin. If it digests all that excess alcohol in your stomach, you could die. So it removes it all in hopes you’ll stop drinking and let yourself recover.
“Something is wrong, empty the tank and start over”.
It pulls from your body in general, like with urine. It just sort of, excretes into your large intestine. The water acts to ‘wash’ out your intestines to get rid of whatever is making you feel bad. The body doesn’t really distinguish between the different problems though, so a lot of problems are solved with diarrhea and fever.
When you eat and drink, various parts of the food are broken down and absorbed by different parts of the body, including water. The main place this happens is your intestines. If the food moves too slowly through the intestines, too much water will get absorbed, and you’ll have a hard, dry stool (constipation). If it moves too quickly, not enough water gets absorbed, so the stool will be watery (diarrhea).
If you’ve eaten something poisonous or diseased (or your body thinks you have), it will increase the speed to get the offending thing out as quickly as possible. This means your body doesn’t have the time to slowly absorb the water, so it gets flushed out with everything else.
And since your body isn’t absorbing the water (it’s moving too fast to do it), you’ll end up dehydrated unless you drink more water than usual to make up the difference.
As for why its WATERY: most of your water absorption happens in your large intestine. One of the last thing your body does after extracting all the nutrients it can out of whatever’s youve eaten/drunken, is to absorb a bunch of water out of what’s left. Your body needs that water, plus it means you have to stop to push out waste (poo) less often. But this process takes some time. So when your body freaks out for whatever reason and decides to take the “jettison all contents” route and get whatever is in your guts out ASAP, your poo doesn’t hang out in your large intestine long enough to dry out any appreciable amount. This is also why dehydration is such a big risk with extended diarrhea. Even if you’re drinking water you’re barely absorbing any of it. It’s also why your poo gets much harder and firmer if your GI tract slows down; it has that much more time to hang out in your con and dry out more.
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