The earliest monograph on dietotherapy materia medica in the history of dietotherapy in China was written on the basis of Meng E's nourishing prescription. Some people may not be familiar with Meng E, but everyone is familiar with his teacher Sun Simiao.

Sun Simiao was an outstanding doctor in Tang Dynasty. Few people know that he is still a centenarian with a long life. He recorded in "Emergency": "As a doctor, a husband must first know the source of the disease, know what disease he has committed, and treat it with food. If the diet is not cured, then give medicine. " It can be seen that dietotherapy is the most basic treatment. I'm afraid his longevity has something to do with his emphasis on diet therapy. In his Emergency, there is a special volume Diet. Sun Simiao's thought of attaching importance to dietotherapy naturally influenced his disciple Meng E. ..

In the first year of Shangyuan (674), Meng Chang met the famous doctor Sun Simiao and learned from him, thus being influenced by his medical thoughts.

When Meng E served as the Sherman of Fengge, he saw the gold given to him by the imperial court at the home of Liu Yi, assistant minister of Fengge. He immediately recognized that it was not real gold and bluntly said, "If this medicine is burned on it, it will have five colors." After inspection, it is true. When Wu Zetian knew about it, she hated it, was exposed by Meng E, and then made an excuse to demote him as Taizhou Sima. This incident reflects that Meng Chang was familiar with alchemy and had rich experience in identifying a chemical substance.

In the early years of Shenlong (705), he retired to Yiyang Mountain, specializing in medical health research. His famous health saying "Good words never leave your mouth, and good medicine never leaves your hand". In his later years, his memory and physical strength are still like a mature man. Compared with his master, he lived a long life. He died at the age of 93.

Materia Medica for Dietotherapy records about 260 kinds of rich and varied foods such as fruits and vegetables, rice grains, birds and animals, fish and insects, and introduces the dietary taboos and medicinal values of these foods in combination with practical experience. It is a dietotherapy book that combines food suitability with food taboos, and combines dietotherapy prescription with body use. Once this book was published, it was highly valued by medical scientists in past dynasties. Worth reading.