My opinion, not as learned as Lindil's, is that it depended on incarnation. I believe they could choose to incarnate in forms that required food, or not. The Istari did for the sake of appearing more normal. Huan most likely ate, and Smaug ate ponies and threatened to eat dwarves, though he might not have had to.
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But then there was a star danced, and under that was I born.
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