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nrron t1_j2e5wpk wrote

Who says it doesn’t? That’s essentially what diarrhea is, your intestines not absorbing the water moving through system into the blood stream and just sending it right out.

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bandit69 t1_j2e779a wrote

Which poses the question, what can cause the intestines to not absorb the water?

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nrron t1_j2e7hbh wrote

Generally, an illness or eating something bad will trigger something in the stomach that tells the brain we need to empty the system now. The brain tells the intestines to fast track everything which doesn’t leave time for the water to be properly absorbed so it’s just along for the ride

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Dayofsloths t1_j2ee2o7 wrote

Yeah, if something triggers us as being a potential parasite or poison, your bowels turn into a water slide.

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Ansuz07 t1_j2e2ggx wrote

One of the primary jobs of the intestines is to absorb water from the digested food processed by the stomach. The water is extracted and put back into the bloodstream (along with other nutrients) where it is processed by other organs. The kidneys then filter the blood for waste products and use some of the water to expel that waste.

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MyFavDinoIsDrinker t1_j2e82n4 wrote

In your stomach, food and liquid gets churned and processed with acid and enzymes, so by the time it moves into your intestines it is basically just liquid.

As it passes through your intestines, a lot of the molecules in it will go through the membrane and into your blood. This includes most of the water and most of the small nutritional molecules like sugars, but leaves behind other things like large non-digestible molecules like fiber.

What doesn't leave your intestines ends up forming your feces. Your urine, on the other hand, is blood that has been filtered by your kidneys.

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