Hmmm, I would probably say that certain Ainur, such as those that had taken on the restrictions of living as a Child of Illuvitar in Middle-Earth (e.g. Melian, the Istari...) would perhaps have been in need of nourishment for bodily strength. This said, I think it likely that these Maiar, and the Istari in particular, would have been able to go without if they needed to as food nutrition is, I should think, not an inherrent Ainurian need as it is for those of more earthly race. Which is why Maiar might need to when they impose Middle-Earth upon themselves.
Yeah, apart from Gandalf and Saruman, and probably Melian, I can't think of any other Maia that provides an example. Which fits in with the above theory, I spose. Unless it is Goldberry, but, was she a Maia, she too could have been said to have taken on the impositions of Earth through being coupled with Tom -- clearly something involved with the natural world. Its laws he must follow, and so Goldberry perhaps with him.
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