Here are some great books and websites dedicated to why we get fat, how to get fit and some inspiration and motivation.
Why We Get Fat: And What to Do About It
Wheat Belly: Lose the Wheat, Lose the Weight, and Find Your Path Back to Health
The Vitamin D Cure, Revised
The Big Fat Surprise: Why Butter, Meat and Cheese Belong in a Healthy Diet
Bright-Sided: How Positive Thinking Is Undermining America