In the Ming Dynasty, Gao Lian's Preface to Ancient Essays was the best one. He carefully studied the diet works of the previous generation and thought that "the diet should be hungry, chewed, and thirsty." Eat before you are hungry, don't eat too much, don't feel thirsty or even drink water, and don't drink too often. Eating fine is not greasy, and drinking warm is not greasy. "He also said," eat and drink in time, hungry, gas level, JingXie was born. Wei Rong can walk, and his insides will be flat, and your mind will be calm, and righteousness will rush inside, which will really take Yuan Shen to the outside, and internal and external evils will be incompetent, and all diseases will be difficult. "