On my 7th-ish re-read I noticed something about the mention of corn that made me wonder whether GRRM inserts it as a signal that the character is about to have their fate changed completely, and start on their true path of destiny. Bran often feeds corn to the ravens atop the tower which he then gets thrown off, thus beginning his true purposeful journey.  Arya passes corn, wheat barley fields with Yoran and dines on roasted corn in the husk just before Lorche kills the band with Yoran