Health preservation is a lifelong matter, but it is not a simple matter. You should balance the acid-base of yin and yang, and you should not get angry or catch cold. Now everything in the world is fake, our food is running out, and there are many aspects of our constitution that we can't argue with. In a word, we need to know our physique, whether it is true or not, and then make a health care plan. And people's physique is still changing with age. Many people give themselves to so-called health clubs and health care drugs that anyone can take. Do you think it is reliable? You'd better learn this knowledge first and study yourself thoroughly before talking about health preservation!