Food for Maiar Thought

[Amarie of the Vanyar]

In HoME 10, 'Morgoth's Ring' it is said

Morgoth, at the time of the War of the Jewels had become permanently 'incarnate'
VII, Notes on motives in the Silmarillion

Then, as a fully incarnate, it is likely that Morgoth was the only Vala who needed to eat.