I located the quote by Michael Pollan, "Eat food. Not too much. Mostly plants," and here's an article he wrote:
http://www.nytimes.com/2007/01/28/ma...anted=all&_r=0
I love the distinction he makes between "food" and stuff that pretends to be food but isn't. I probably need to read this every time I sit down to make a grocery list.