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What ancient poems or famous sayings are suitable for school canteens?

You know what you eat. -Soviet Union

Who knows that every grain of Chinese food is hard? -Li Shen's "Compassion for Farmers"

Sleep without talking, eat without talking. -"The Analects of Confucius Township Hall"

It is easy to be frugal, but difficult to be frugal. -Sima Guang of the Northern Song Dynasty

Thrift and simplicity are human virtues. —— Ming Xuexuan

It is not easy to think about a porridge and a meal; It is difficult to keep thinking about material resources. -Zhu Qingyongchun