Book Excerpt: Your Brain on Food

In this excerpt from Your Brain on Food, author Dr. Gary Wenk breaks down the barrier between "food" and "drug," explaining the many ways both substances affect our minds, bodies and behaviors. To purchase your copy of Your Brain on Food: How Chemicals Control Your Thoughts and Feelings, click here.

Reprinted from YOUR BRAIN ON FOOD: How Chemicals Control Your Thoughts & Feelings, by Gary L. Wenk (Oxford University Press).© 2010 by Oxford University Press.