People's psychology, emotion and body can be interrelated and influenced by the nervous-endocrine-immune system. When the mood fluctuates, the human body will have low immunity due to negative mental stimulation. Emotion is not only regulated by cerebral cortex, but also closely related to limbic system, reticular structure of brain stem, autonomic nervous system and endocrine system. Clinical studies have found that nervousness can lead to nervous dysfunction, hyperfunction of sympathetic nervous system, increased heart rate, blood pressure and blood sugar, gastrointestinal dysfunction, and some symptoms such as headache, low back pain, decreased saliva secretion, accelerated breathing and frequent urination. Nervous mood will also affect the activity of white blood cells, which are important immune cells in human body, so emotional tension will reduce people's immune function. There are all kinds of diseases. When people feel angry and desperate, the body will secrete a lot of stress hormones such as cortisol and adrenaline, thus inducing hypercholesterolemia and hyperglycemia. People who are irritable are also more likely to suffer from myocardial infarction, angina pectoris or other symptoms of coronary heart disease. In addition, a lot of evidence shows that people who are irritable and irritable are prone to atrial fibrillation.
The highest state of meditation is inaction. It takes Xiu De to cultivate one's mind, and only when one is highly respected can one be calm and calm. Returning to simplicity and pursuing morality is the Taoist idea of health preservation. Meditation focuses on spiritual cultivation, and in the final analysis, it is to purify people's souls. "The Inscription of Nurturing the Gods" points out: "God is the son of Qi, Qi is the mother of God, and the shape of God's room ... When God goes, it will rot." God is born of qi and shape, but it plays a dominant role in shape, body, essence and qi, which is the value and symbol of their existence. The relationship between essence and god is vividly described as "spirit is like fire, essence is still oily" in the law of essence determination. Essence can be understood as the material basis of human body, and this material life activity can be summarized as the whole "God", such as the flame of a lamp. If a person wants to stay healthy and live a long life, he must grasp the three treasures of storing essence, storing qi and recuperating. (Editor Gan Tang, author Wang Xiangrui, please indicate the source)