Dean Ornish on the world's killer diet

In a sobering 3-minute talk, Dr. Dean Ornish tracks the dramatic spread of obesity, diabetes and cardiovascular disease around the globe -- as people outside the US start to eat, live and die like Americans do.
"This may be the first generation in which our kids live a shorter lifespan than we do," Ornish says. The good news? These trends are preventable and even reversible through diet and exercise.