From the Qing Dynasty gourmet Li Yu's "Casual Messages", it is a comment on hairy crabs: as long as good ingredients are used in the simplest way, there is no need to add any auxiliary spices or other ingredients, and their own flavor is enough. It can also refer to: all good things have their own unique values, and there is no need for anything else to set off and highlight them.

The writing of Casual Stories is close to the vernacular at that time, which is simple and easy to understand. In addition, he is humorous and makes the boring theory of keeping in good health interesting. Therefore, his health preserving theory had a far-reaching influence at that time and later. In 1935, Lin Yutang's English version of My Country and My People gave the book a high evaluation, and thought it was "a guide to China people's living art".

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Casual Love Letter * * includes eight parts, such as Ci Qu Bu, Exercise Bu, sound volume Bu, Living Room Bu, Playing with utensils Bu, Drinking and Eating Bu, Planting Bu, and Retirement Bu. Most people only refer to Ci Qu Bu. In fact, this understanding is one-sided. Huang Qiang thinks: "All the eight parts of Casual Notes are integral parts of Li Yu's theory of health preservation", but "The Department of Support for the Elderly is devoted to health preservation, while other parts discuss the necessary expertise of health preservation".