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Do you need a citation or can I safely assert: "Things are good for me that make me feel good absent it being a poison."I don't need a citation, no, this is pretty obviously false.
Once again, go ahead do do what you want, but asking for a citation when people are recommending a change in lifestyle because it is "good for you" is a completely reasonable thing to do.
Especially when their first ask was "Just a simple explanation why it is so obvious and so beneficial." (i.e., not a scientific study or anything), to which you responded with some hand-waving and a question instead of a simple explanation.