Health knowledge. Health preservation is also a verb. This is a medical activity of Taoism to recuperate life, strengthen health, prevent diseases and prolong life in various ways. The knowledge of health and wellness is what health and wellness consultants are best at. A consultant is a position, which generally refers to a person who has many years of understanding experience and is good at answering questions. They can provide consulting services, and the advice provided by consultants is independent and neutral.