Here is a list of books about health and nutrition that I highly recommend:
Potatoes, Not Prozac (1999)
by Kathleen DesMaisons
In Defense of Food: An Eater's Manifesto (2009)
by Michael Pollan
The End of Overeating: Taking Control of the Insatiable American Appetite (2010)
by David Kessler
Why We Get Fat: And What To Do About It (2010)
by Gary Taubes
The Inflammation Syndrome: Your Nutrition Plan for Great Health, Weight Loss, and Pain-Free Living (2010)
by Jack Challem
The Paleo Solution: The Original Human Diet
by Robb Wolf
Wheat Belly: Lose the Wheat, Lose the Weight, and Find Your Path Back to Health (2011)
by Dr. William Davis
Weighing In: Obesity, Food Justice, and the Limits of Capitalism (2011)
by Julie Guthman
It Starts With Food: Discover the Whole30 and Change Your Life in Unexpected Ways (2012)
by Dallas and Melissa Hartwig
And for those who prefer to watch, a few documentaries:
Food, Inc. (2008)
Fat Head (2009)
The Weight of the Nation (HBO documentary series)