From Speaking of Faith (see original link at http://speakingoffaith.publicradio.org/programs/ethicsofeating/index.shtml )
"Barbara Kingsolver describes an adventure her family undertook to spend one year eating primarily what they could grow or raise themselves. As a citizen and mother more than an expert, she turned her life towards questions many of us are asking. Food, she says, is a 'rare moral arena' in which the ethical choice is often the pleasurable choice."
See more at the link above, including an audio interview with Kingsolver. Then see the website devoted to the book and year-long "experiment" in eating only home-grown or locally grown food, at: http://www.animalvegetablemiracle.org/