I like Marion Nestle. She knows what's what when it comes to food. She does the research and is qualified to give you an opinion. While we are all left to make choices on our own, I have great respect for someone who makes it her mission to inform the public of just how much the government controls everything we eat. (She also wrote “Food Politics” which is on my short list of things to read…)
So, I give you this link to an hour-long talk she gave at Google about a year ago. I think she's worth watching and listening to.
I'm currently reading her book and find it pretty interesting…especially as someone who cares greatly about what I eat.
“What to Eat” by Marion Nestle on Amazon.com
And if you're interested in what else I've read recently…
“The Omnivore's Dilemma: A Natural History of Four Meals“ by Michael Pollan on Amazon.com