I've really been inspired by John Robbins.
For anyone who doesn't know who he is, he's the son of one of the founders of Baskin Robbins, and was in the movie Supersize Me.
He's written a few books, my favorite of which is Diet For A New America.
Here's the description from Amazon:
In 1987, John Robbins published Diet for a New America, which was an early version of this book, and he started the food revolution. He continues to work tirelessly to promote conscious food choices more than 20 years later.
First published in 2001, The Food Revolution is still one of the most frequently cited and talked about books of the food-politics revolution. It was one of the very first books to discuss the negative health effects of eating genetically modified foods and animal products of all kinds, to expose the dangers inherent in our factory farming system, and to advocate a complete plant-based diet.