Because poop is formed by the leftovers from food, bile and mucus after all the good stuff is removed.
Piss is formed more actively, About 50 gallons of very dilute water is filtered from your kidneys, Nearly all of it is resorbed, Specially cells grab all the stuff your body wants to keep such as Sodium and Vitamin C and sends those back to the blood.
Also the body never absorbs the capsacin from hot foods as it’s not a nutrient so it says in the intestines. The kidneys don’t have access to it since it’s not in the blood.
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