The concept of health means that a person is in a good state physically, mentally and socially. The main contents of health are: ① no disease in the main body organs, good development of body form, uniform body shape, good physiological function of the body’s various systems, strong physical activity and labor capacity; ② to have a strong resistance to disease, able to adapt to changes in the environment, able to adapt to a variety of physiological stimuli, disease-causing factors on the body. The meaning of modern health is diversified and broad, and the modern view of health is overall health. It is not only about being physically free of disease, but also having mental health, good social adaptability, and having morals. The four cornerstones of health maintenance are a balanced diet, moderate exercise, cessation of smoking and restriction of alcohol consumption, and mental health.