In reply to Andrew Kin:
In the two training beta podcasts he says he eats a plant-based diet: mostly vegetables, pulses and nuts. He has been eating a little more fish recently. He says he doesn't feel the need for protein suppliments.
He doesn't mention his Dawn Wall diet. He seems to have quickly adapted to local ways so perhaps he ate bagels, pop tarts and canned peaches, and drank malt liquor, like a proper Yosemite climber.