Wan Mizhai's monograph "Four Essentials of Health Preservation" has unique views on health preservation, disease prevention and eugenics. His theory of health care without desire, prudence, timeliness and illness is not only hundreds of years earlier than the health care concepts advocated by the World Health Organization, such as psychological balance, balanced nutrition, proper exercise, smoking cessation and alcohol restriction, but also more comprehensive, advanced and scientific.

Wan Mizhai was originally a student, but after failing in the exam, he decided to study medicine. Because his family has helped the world with medicine for generations, medicine has a deep family origin, and I study hard and sum up clinical experience diligently, so his medical attainments are profound. He is rigorous in his studies and noble in medical ethics. He has been practicing medicine for more than 50 years and is unique in health care theory and practice.

Wan Mizhai's personal experience.

Wan Mizhai's medical treatment is based on Neijing and Nan, in addition to inheriting family knowledge. He made a thorough study of Pulse Sutra and Materia Medica, adopted the theories of Zhongjing, Hejian, Dongyuan and Danxi, and also learned the knowledge of Neijing, gynecology, pediatrics and health preservation. His medical skills are getting better and better, and he became famous in Qin Long during the Wanli period. Practice medicine all over Luotian, Qishui, Yingshan, Macheng, Huanggang and other places, as far away as Wuchang and Yunyang, and there are many living people.

Wan is not only superb in medical skills, but also noble in medical ethics. He denounced quack doctors for misleading others, opposed witch doctors to confuse people, and adhered to the principle of "caring for the old and caring for the young" and "treating other people's sons as their own sons". He treats diseases without remembering old grievances, sympathizes with hard work, and sends medicines to doctors, which is deeply loved by the people.