holy smokes! this is a fascinating essay by michael pollan that was in last Sunday's NYtimes magazine.
http://www.nytimes.com/2007/01/28/magazine/28nutritionism.t.html?pagewanted=11&ei=5070&en=9084b6c9320eb818&ex=1170824400&emc=eta1 if you at all interested in food, culture, science, politics, sociology, or nutrition, i highly recommend that you read this.
Speaking of Michael Pollan, has anyone read the Omnivore's Dilemma? It has certainly moved to the top of my to read list