World Health Organization (WHO) make a formal definition to health:

(1) good energy, can deal with daily life and work;

(2) doing anythings optimistic, positive attitude, willing to undertake the task;

(3) good rest, sleep well;

(4) strong adaptability to adapt to environmental changed;

(5) have a certain resistance to common cold and infectious diseases;

(6) standard weight, the proportion of various parts of the body is coordination;

(7) bright eyes, quick in response and the eyelids have no inflammation;

(8) Tooth Whitening, no defect, no pain, gingival is normal, no cavities;

(9) hair is bright and clean, no dandruff;

(10) skin is shiny and flexible, easyly walking, has dynamic.

Health is not only to the absence of disease or illness, but also a physical, mental and social complete in a good condition. It is means that healthy people have a strong physical and mental state of optimism, and can live with the social and natural environment, maintain a harmonious relationship.