The Bama Yao People Autonomous County in Hechi is renowned as the Land of Longevity. In the county, now there are 81 old people at an age of more than 100 years. The scientists said this phenomenon relates to the local environment, heredity, dining, laboring, mental factors and many other factors. The characteristic of the local meals are low energy, low fat, low salt, low cholesterin and low protein.