"Good book, but read The Omnivore's Dilemma first"
I enjoyed the book, but if you haven't read The Omnivore's Dilemma, read it first - not as a prequel, but just because it's a more in depth discussion of our industrialized food system and how it's failing us. You may not be convinced of this by In Defense of Food, but you will be by The Omnivore's Dilemma.
If you have The Omnivore's Dilemma, this book is a bit like preaching to the choir, but still well worth the read.
Also, I hate to "dis" the narrator, but he distracts from the book. I've heard his narration of other books and enjoyed them, but they were all fiction. He put a little too much drama into his reading of this non-fiction book about food.