Hunza is high in the Himalayan Mountains of Asia. There, many people over one hundred years of age are still in good physical health. Men of ninety are new fathers, and women of fifty still have babies. What are the reasons for this good health? Scientists believe that the people of Hunza have these three benefits: (1) physical work, usually in the fields or with animals; (2) a healthful environment with clean air and water; and (3) a simple diet high in vitamins and nutrition but low in fat, cholestrol, sugar, and chemicals.