"Hara hachi bu. That's what I need to do," Oprah says. "And how do you know when you're 80 percent full?"
"Well, the reality is, and many of you have experienced this, if you eat what you normally eat in a meal, you'll feel really full about 15, 20 minutes later," Dr. Oz says. "The only way to really know you're going to be 80 percent full is to stop eating way before you think you're going to be full."
More health secrets from Dr. Oz, America's Doctor