Plants don’t consume poop directly, but bacteria and fungi do. While doing so they break down and sort of “simplify” the components and the byproduct of that is available for plants to use.
What is in your poop is not useful to your body cause you can’t use it, but it doesn’t mean it has no value to other types of life, that consume nutrients differently and metabolize them in other manners. It’s how available the nutrients are to a certain being that make it “food” or not
To give you another example: a cow can digest grass, but you can’t.
Edit: it’s impressive how all comments are about the cow and the grass
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