Obesity—the state of being very overweight—is more than a problem in the world today; it's a crisis. One out of every three adults is obese. Childhood obesity is a major health concern as well. Experts agree that fast food is one of the most significant factors behind bigger bodies. For many people, fast food has become more than a quick way to grab a meal; it has become a way of life. Learn how fast food and the fast-food industry have shaped not only our bodies but also our lifestyles. Discover how to fight the fast-food industry's hold over the world's diet.