From The House of the Spirits by Isabelle Allende:
"His father... ordered Nicolás to take a bath and put on some normal clothes if he wanted to stay in the house, but Nicolás stared at him without seeing and did not reply. He had become a vegetarian. He did not eat milk, meat, or eggs. His diet was the same as a rabbit's, and his anxious face gradually came to resemble the face of that animal."