I stumbled across this while I was looking for studies about the addictive qualities of processed foods (random, I know) and I thought I'd share.
How To Win An Argument With A Meat-Eater:
http://www.vegsource.com/news/2009/09/how-to-win-an-argument-with-a-meat-eater.html
It's a bit outdated, I know, but I was still amused. I'm sure we've all had to argue about our dietary choices at one point or another.