Here are some really great books that have been an incredible help to me.
http://www.amazon.com/Omnivores-Dilemma-Natural-History-Meals/dp/0143038583/ref=sr_1_1?s=books&ie=UTF8&qid=1303139232&sr=1-1
http://www.amazon.com/Nourishing-Traditions-Challenges-Politically-Dictocrats/dp/0967089735/ref=sr_1_1?s=books&ie=UTF8&qid=1303139299&sr=1-1
http://www.amazon.com/Real-Food-What-Eat-Why/dp/1596913428/ref=sr_1_1?s=books&ie=UTF8&qid=1303139331&sr=1-1
http://www.amazon.com/Defense-Food-Eaters-Manifesto/dp/0143114964/ref=sr_1_1?s=books&ie=UTF8&qid=1303139372&sr=1-1
And here are a couple Documentaries that have been very helpful:
http://www.foodincmovie.com/
http://www.fathead-movie.com/
AND - A Website with the most amazing information. This will knock your socks off!
http://westonaprice.org/