I've always found certain figures of speech involving language and texts interesting. We have "food for thought," a phrase that goes beyond it's mere equivalence to "thought provoking," raising the reading experience to a taste sensation. We refer to "a consuming read," suggesting that the book itself is eating us, the reader, or that we are at least caught in its jaws and can't be extricated. And there is the "omnivorous reader," someone with a voracious intellectual appetite that knows no limitations.
Of course eating as figurative speech is not limited to texts, no doubt due to the universality, necessity and pleasure of eating as a human activity. Among others, people "bite off more than they can chew" and bad experiences "leave a sour taste in your mouth." And who hasn't been told by someone that they intend to make you "eat your words?" An odd phrase, but what better way to visualize taking back something you've said, the very sounds that come out of your mouth, if not by eating and swallowing your own words? As a book lover, I've wondered why reading is never used figuratively with food. "Oh man, this Hollandaise sauce is so Nabokovian--it would make even sewage taste good!" Or, "Mmm mm, this Étouffée is as complex and tasty as a Henry James sentence."
There are at least five circumstances, however, in which "food for thought" may go beyond mere metaphor or simile. More...