Frankly, Lots Of Americans Are Overweight. How Does The Rest Of The World Stay Slim?

It's no secret Americans are getting fatter and fatter. At first, it was the received wisdom to eat low fat foods to lose weight. Now, it's more about avoiding sugar and simple carbohydrates. But can something be learned from our thinner neighbors around the world? For instance, the healthy and long-lived Japanese on the island of Okinawa only eat until their belly is 80% full.