While driven away from mankind, what did Nebuchadnezzar eat?

Answer: Grass like an ox

As Daniel foretold, the proud king was driven from people and ate grass like an ox, drenched with the dew of heaven.

“At that moment the sentence against Nebuchadnezzar was fulfilled. He was driven away from mankind. He ate grass like an ox, and his body was drenched with the dew of heaven, until his hair grew like the feathers of an eagle and his nails like the claws of a bird.”— Daniel 4:33 (BSB)