I think that Tolkien says somewhere about elves, that they can more or less look like they wish. Or, better said, that they are not so much bound by the material world in these terms. Possibly neither of them wants to look fat 
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"Should the story say 'he ate bread,' the dramatic producer can only show 'a piece of bread' according to his taste or fancy, but the hearer of the story will think of bread in general and picture it in some form of his own." -On Fairy-Stories
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