Everyone seems to know a little about health care, but without the guidance of professionals or professionals, the knowledge of health care will inevitably be one-sided. Health preservation should be a comprehensive systematic project, which integrates knowledge of diet, exercise and psychology. This is not easy to do. In addition, theory is one thing, and practical application is another. Real life is always complicated and needs to be dealt with flexibly. But as far as diet is concerned, as the saying goes, delicious food is not nutritious, and nutritious taste is poor. Therefore, it is difficult to give consideration to both delicious food and nutrition, and most people will choose simple and enjoyable food, which is difficult to do. I don't think it's necessary to give up delicious food for health. If both can be taken into account, the effect of health preservation will be much better.