NEW: Dr. Oz says improving Americans’ health could delay retirement, cut healthcare costs, and supercharge economic growth: “If we're able to get the average American, who today retires on average at age 61, get them just to work one year longer, because they feel so vital, so strong, so bullish about their future, because they're feeding their bodies nutrients that are essential to their high functioning productivity, we will increase the overall GDP of our nation by trillions of dollars." "We