Chinese and foreign experts reported the relationship between unscientific diet, smoking and passive smoking, static lifestyle and other factors and the occurrence of chronic diseases, as well as the conclusive evidence that about 80% of heart diseases, stroke, type 2 diabetes and 40% of tumors can be prevented after controlling risk factors. According to the experts’ interpretation, the process of a person’s transition from health to disease is: being in a low risk state for disease, entering a risk state for disease, developing early changes, developing clinical symptoms, developing disease, and obtaining a different prognosis.