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I saw a sentence labeled on a packaging, saying Do not reheat once cooled. I am wondering why here they used cooled rather than cool. and in turn, another question that can we say eat (serve) cool (cold) or serve cooled follows.

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Complete version:

Do not reheat [this] once [it is] cooled.

For your next sentence, "eat cool food" and "eat cooled food" both seem valid. Here cool and cooled are both used as adjectives, which are opposite to "hot". "Cooled food" could be transformed to "food that is cooled".

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