While browsing geminispace, I came across this article by negatethis. Below is the text of the email I sent in reply, lightly edited. This is by no means a complete explanation of my thoughts on the subject; for example, I spend little to no time on the ethics of animal domestication.

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."