Su Dongpo, a famous writer, painter, poet and gourmet in the Northern Song Dynasty, was one of the eight great poets in the Tang and Song Dynasties. He is also very picky about his health.

Once, Su Dongpo's friend Zhang E asked Su Dongpo to write something about health preservation. He got four kinds of elixirs. Su Dongpo replied in four sentences, that is, "things are rare, early to bed is rich, walking in peace is a car, and eating at night is meat."

"Things are scarce" means that people should not pay too much attention to fame and fortune, gains and losses of interests, and sometimes they are content with the status quo, and a normal mind can live longer than fame and fortune.

"Go to bed early and get rich" is to form a good habit of going to bed early and getting up early, instead of staying up late, which is not easy to do in practice. The common problems of modern life, such as staying up late and lack of sleep, have become a common problem. "Going to bed early" means rejecting all temptations, that is, watching less TV, playing less games and playing less mobile phones. Going to bed early is good for your health.

"Think of your time as a car" means that people should not have too much fun, but should walk instead of taking a car. Only by exercising more can they keep fit, dredge meridians and activate vitality, which is still suitable for modern life. Try to spread your legs and walk more. It is also a good way to walk to work.

"Eating meat at night" means that people try to eat as much as possible when they are hungry, but not too full, just seven minutes full. Such a diet, even a simple meal, is better than delicacies. In fact, it is based on modern scientific research to properly control food intake and prolong life.

When I was a child, I always ate when I was hungry. At that time, eating tasted better than anything. My son, now 12 years old, barks at every meal, is picky about food and runs around eating, but he doesn't feel hungry.

The last two sentences are from the Warring States Policy, "Go slow, go slow; Eat late, eat slowly.

In short, we should be normal, go to bed early and get up early, walk as much as possible, eat when we are hungry, and don't be too full. Even now, it is still positive.