Li Yu's Random Thoughts in Qing Dynasty is a classic of health preservation. Comprises eight parts: a qu qu part, a sports part, a volume part, a living room part, a toy part, a drinking water part, a planting part and a nursing part.

This paper discusses various phenomena in art and life such as opera, song and dance, costumes, ability training, gardens, architecture, flowers, playthings, old-age care, diet, etc., and expounds his own opinions, which are extremely rich in content. Among them, Nursing Department is an important document on health preservation.

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Scattered mail includes eight parts: qu qu Bu, sports Bu, volume Bu, living room Bu, playing with electrical appliances Bu, drinking and planting Bu, and nursing home Bu. Most people only regard "Nursing Home Bu" as a health book. In fact, this understanding is one-sided.

Huang Qiang thinks: "Eight essays are all parts of Li Yu's health-preserving theory", but "the department for supporting the elderly specializes in health-preserving, and the other parts discuss the necessary professional knowledge of health-preserving". The writing of Suiyuan is close to the vernacular at that time, which is simple and easy to understand. Besides, he is also humorous, which makes the boring theory of keeping in good health interesting.

Therefore, his theory of health preservation had a far-reaching impact on that time and later generations. 1935 Lin Yutang's English version of My Country and My People gave a high evaluation of the book, which was regarded as "a guide to China people's life art".

Refer to the above? Baidu encyclopedia-casual hair (health knowledge)