I once saw a sign in a health food restaurant that read, “You are what you eat.” So I pointed out to the waitress that this was true only if you are identical to (the same thing as) your body.
Further, if you are what you eat, then you couldn’t be something until you’ve eaten something. But you can’t eat something until you are something. So you must be something before you eat something. Therefore, it’s not true that you are what you eat.
The waitress looked a me and said, “You’ll have to talk to the manager.”