For example, paper, soap or dust. Its not supposed to be eaten but our tounges are able to taste it & signal to the brain that it doesnt taste good compared to real food
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Your tounge tastes the substance. You stomach digests it. The two are not related. There’s no reason to think that your tounge shouldn’t be able to taste something that your stomach can’t digest.
Generally we learn what can be digested and what can’t as they typically taste different. And we associate “nice” tastes with things that can be digested.
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