I want to offer two references in the background of this sermon:
Flannery O'Connor The Violent Bear It Away
Rowan Williams "Interiority and Epiphany: A Reading in New Testament Ethics" On Christian Theology
I should also offer references on the claims about food, but the press is full of them, including Food, Inc. and all the things by Eric Schlosser and Michael Pollan and Gary Hirshberg. There are many other sources out there. Read up and eat local.