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. Everything goes in the same space (your stomach and then your gut). Things that don’t get absorbed by the intestinal walls remain in the gut and are eventually expelled as solid waste. All other waste is transported by your blood to your kidneys, filtered out and expelled as urine.
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