This is something that has always puzzled me.
How does your body understands that these minuscule substances (like spices or seeds) aren’t liquid but instead considered food, and, how does it manages to sort out everything when your stomach has a bunch of things on it at the same time?
In: Biology
It doesn’t do anything like that. Your body absorbs water when the tissues have a lower concentration of water than what is around it. That is usually the case when you eat because most of our food contains a good bit of water, and we usually drink more liquid to go along with it.
While you are absorbing water, you also absorb any nutrients that are dissolved in the water. Eventually you end up absorbing most of the nutrients, and what is left is the indigestible solid material that later becomes feces.
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