One is Ren, who likes to be a layman. He believes: "Health depends mainly on yourself. You need not worry about your health every day. It is best to let nature take its course. " He spoke highly of Laozi's view of "forgetting my body and living" and insisted on "reading more, sleeping more and using more brains" to "nourish my heart". He never takes any tonic, and firmly believes that "blood is born of qi, and qi is a tonic" in Chinese Medical Code. He died at the age of 93.

The other is Liang Shuming, who "does not seek immortality, but seeks to waste life" and is open-minded about life and death. He worked hard all his life and experienced ups and downs. But he lived to the age of 95, and was known as the "super standard health of the elderly". He said that the secret of longevity is to be indifferent to me and let nature take its course.

There are various health preserving theories, such as advocating "rest", advocating "abstinence" or emphasizing "external supplement", and so on. Although there is some truth in all this, it is an important way of fitness to follow the laws of nature and let life complete the natural process.

Let nature take its course, that is, according to the requirements of nature, nourish the heart internally and shape externally. Coarse grains are simple in tea and light in rice, and they are taken naturally. As the saying goes, "Five grains are for raising, five animals are for profit, five fruits are for taking, and five dishes are for filling." It is also necessary to cultivate healthy interest in life, advocate moderate diet, arrange and choose meals reasonably, ensure regular and quantitative meals, and balance the intake of various nutrients.

Letting nature take its course also means that the human body should keep moving like nature. As the saying goes, "Running water does not rot, and the home axis does not bite." People who exercise regularly can adjust and improve the whole body's blood circulation, take in high oxygen content, enhance cardiopulmonary function, delay aging, prevent diseases and keep fit. Of course, exercise must be moderate, and you must choose the exercise method that suits you according to your age characteristics, and do it without interruption.

Let nature take its course, but we must also grasp the laws of nature and conform to nature. Don't give yourself too much pressure. No matter how fierce the competition is, how much temptation there is, and how exciting the opportunity is, we must cut off half of the desires in our heads and stop. We should try our best to adjust our inner activities to a relaxed, broad-minded, stretched and balanced state, learn to take things as they are, avoid exultation and great sadness and strong emotional fluctuations, and make ourselves philosophical, tolerant of others and simple in spirit. Because inner peace contributes to the smooth flow of blood, quietness and indifference help to support a person's life. A good mental state can also promote the coordination and orderly metabolism of the functional activities of various organs of the body, thereby enhancing immunity and reducing the occurrence of diseases. As Marx said: "A good mood can relieve the fatigue and pain of the body more than ten good medicines."

Let nature take its course, that is the calmness of life, that is the treasure of life. It can make you really enjoy life, experience happiness in pursuit, enrich yourself in indifference, and get health naturally.