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In Treatise on Cold Pathogenic and Miscellaneous Diseases, there are five articles concerning " diet as usual". When many doctors annotate such articles, they mostly interpret " diet as usual" as normal diet or because of stomach qi not affected by disease, ignoring the true significance of " diet as usual" and its role in clinical differential diagnosis. Through sorting out and summarizing the relevant provisions of " diet as usual", combining with the comments of Shuowen Jiezi and various ancient and modern doctors on the relevant provisions of " diet as usual" to explore the meaning behind it, the author believes that " diet as usual" can only be understood as " diet as before". Because it exists in a variety of diseases, it cannot be blindly extended to " normal diet". " Diet as usual" has two functions in clinical differential diagnosis: on the one hand, the stomach is empty, and no solid no drink blocks the qi movement, or there is stagnant heat in the stomach and intestines, but has not yet formed dry feces; on the other hand, when the middle jiao becomes one of the pathogenic factors of the disease, " diet as usual" can exclude the influence of the middle jiao. [ABSTRACT FROM AUTHOR]