Check out this blog on the rise in importance of food ethics.

"Food ethics is becoming more complex than it used to be. With the recent crisis in China over baby formula, the slow food movement, the debates over locally grown food, organic food, cloned cattle, trans fats, the obesity crisis and more--food ethics is no longer limited to Leon Kass' The Hungry Soul."

Here is the link:
http://blog.bioethics.net/2008/10/food-ethics21st-century-style/

Blog has a lot of interesting hyperlinks

Omai