He is an expert in dietotherapy. 185 1 Born in a family of traditional Chinese medicine in Fukui Prefecture, he was qualified as a doctor Yamatonokusushi at the age of 22. He put forward an important theory that influenced Japanese culture: "The body and the place of birth are integrated, and the things produced in the place where you were born and raised are most suitable for your physique". He also believes that nutrition at that time paid too much attention to the role of carbohydrates, fats and protein, while ignoring the role of minerals. Eating too much salt, meat and fish will lead to excessive sodium, while eating too much white rice, bread and meat and eating too little vegetables is harmful to physical and mental health. Therefore, he advocated maintaining the balance of minerals-sodium and calcium in food, and even called white rice "dross" and advocated eating brown rice. In addition to the theory of nutrition, Zuo Xuanshi also pointed out that diet education is of great significance to the whole country. He once said that "for children, food education should precede intellectual education, moral education and physical education". In fact, it makes sense to think about it carefully. How can we develop other aspects without good health as the foundation?

Ishizuka Zuoxuan Medical Food Research Institute was founded in Meiji era in Japan. It is a research institute directly under Mr. Zuoxuan Ishizuka, a famous doctor and pharmacist in Meiji Japan. Based on the concept of "diet education" put forward by Zuoxuan Ishizuka, food and health food are planned and put into products.