grammar - Why do we say "eat healthy" instead of "eat healthily"?



Why do we say "eat healthy" instead of "eat healthily", even though the latter is the only "correct" one, according to the comments in


"eat healthy" or "eat healthily"


What came first: ads saying "eat healthy", or the grammatical acceptability of such a phrase?




Merriam-Webster does not consider "healthy" to be an adverb, unlike "quick": https://www.merriam-webster.com/dictionary/healthy, and therefore this question is not a duplicate of As quick as we can?





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