Brief introduction to the book of health preservation: the health and longevity of human body are not only related to congenital factors, but also influenced by acquired factors. The influence of acquired factors is more important. People with superior congenital conditions, if not good at maintenance, will inevitably premature aging or early death. On the other hand, if the congenital conditions are poor, you can still live a long and healthy life as long as you are good at maintenance. Therefore, if you want to delay aging and live a long and healthy life, you must know how to keep in good health. 2 1 century, medical care pays more attention to science. However, many people don't understand or arrange their daily life according to the scientific health preservation theory, which leads to health problems and even premature death. Many unscientific lifestyles have led to many diseases. Experts pointed out. Health preservation lies in balance, that is, promoting the balance of the body and harmony with the external environment.