Does the story refer to eating wood?
The story "Good Country People" does not refer to eating wood.
The title of Flannery O'Connor's story is intended as irony. The religious mother, Mrs. Hopewell, meets what seems like a nice young man, Manley Pointer, who apparently seeks to spread "the word." Manley carries a Bible and presents himself as a God-fearing paragon of virtue. Mrs. Hopewell's daughter, Joy, is an arrogant, condescending atheist, who holds firm to the belief that her sense of judgement is vastly superior to that of her mother. As the story unfolds, it becomes apparent that mother and daughter have both badly misjudged Manley Pointer, whose facade as "good country people" falls away to reveal something far less admirable.