According to Lei Ju, a famous qigong master in the Three Kingdoms period, "I hunted when I was young and starved in an empty grave. Seeing a chinemys reevesii in the grave, I counted it, turned around, and my direction was uncertain. I swallowed with my mouth open, or lifted up or lifted up. Thrift is also known as the tortoise can guide, but I try to do what the tortoise does, so I am no longer hungry. More than a hundred days, quite bitter. Later generations occasionally peep at the grave and come out frugally. After that, I can die. " In the course of thousands of years, there are many schools of divination, which have formed complex methods of eating qi, such as Yin Zhenren's taking qi, Taiwei Yi's taking qi, Wu Tai's taking qi, Maoshan's taking qi orally, Taiqing Wanglao's taking qi, Huan Xuan's taking qi, Lingbao's technique, etc. Their functions are different and their methods are different, but their basic core is still gentle and slender breathing. ?
Humans are warm-blooded animals, even if they are motionless in sleep, they still need to consume energy to maintain their body temperature and internal organs. So from a scientific point of view, it is unrealistic to be persuaded.
Within one day of fasting, the glycogen stored in the liver has been exhausted. Because red blood cells and brain tissues usually only burn glucose, the human body began to convert other energy substances into sugar to meet the needs. After fasting for 36 hours, amino acids are released from muscle protein spots, and alanine is absorbed by the liver to make sugar under the action of hormones. After fasting for 48 hours, the body began to mobilize a lot of fat to produce energy. However, fat is not a "clean energy". In the process of eating, a large number of acidic products will be produced, and the ketone body content in blood and urine will increase rapidly, and the acid-base balance of body fluids will be tested. If hunger is still not lifted, fat burning can't meet the needs of life, and the human body has to decompose protein in large quantities. ?
Protein is the functional unit of life, and the massive decomposition of protein will bring about dysfunction. People with severe malnutrition are on the verge of organ failure, and death is inevitable. Intravenous nutrition preparations prepared by modern medicine for patients who can't eat by mouth are nothing more than main nutrients such as glucose, amino acids and fat emulsion, supplemented by trace elements, vitamins and electrolytes.
Extreme supporters who are convinced of the importance of these nutrients do not deny it, but they believe that nutrients can be obtained not only from food. "I firmly believe that those who avoid grain regard air and water as food, which is the simplest and cleanest food"; "The persuasion advocated in Bigu is to cooperate with abdominal breathing to generate vacuum suction and suck air into digestive tract"; "The reasoning of Taoism's technique of" serving the spirit and avoiding the valley "is that saliva, air and water enter the digestive tract through swallowing and correct breathing, and synthesize nutrients in the body, so that they can maintain their lives without eating whole grains for a long time"; "breaking the grain can induce the production of hydrolase, so that water can be used as energy." Obviously, these statements tend to turn human animal survival into plant survival, but unfortunately, these descriptions can only be found in science fiction, and it is even more unimaginable that "water-decomposing enzymes" can exist in people whose water accounts for more than half of their body weight. ?
While taking medicine, you need to eat omnivores and medicinal bait. There are different schools of medicine. Common omnivores are sesame, black beans, red dates, chestnuts, walnut meat, honey and alcohol. As for drugs, there are many, such as Rehmannia glutinosa, Polygonatum sibiricum, Lycium barbarum, Ophiopogon japonicus, Chrysanthemum, Poria, Atractylodes macrocephala, Pine nuts, Platycladus orientalis, Coicis Semen, Yam, Almond, Paeonia lactiflora, Acorus calamus, Alisma orientalis, Pyrrosia and so on. ?
Others only advocate eating less, and eat a small amount of staple food in the process of eating, which is no different from dieting. Look at this method, its essence is to limit calorie intake. Some of the "drugs" taken in practice are mainly fat and some are mainly sugar, but their calories are far lower than normal diet. ?
There is a secret recipe in Taiping Sheng Huifang edited by the government in Song Dynasty, which is composed of Poria cocos, chestnuts, sesame seeds and jujube. It is required to take 50 grams twice a day in paste. According to Records of Song History, Chen Tuan lived in seclusion in Wudang Mountain. "He has been taking it for more than 20 years, but he drinks several cups a day." It can be seen that crossing the valley is not a hunger strike, and we can't apply the concept of hunger strike that we usually say today. ?
Scientific research has found that from lower organisms, fungi and fruit flies to mammals, mice and dogs, limiting energy intake can prolong the life span of organisms, that is, "hungry" animals not only live longer, but also live healthier.
Scientists speculate that this may be because low-calorie foods reduce the consequences of oxidative stress. Molecular biology research shows that the signal transduction pathway of mTOR (target receptor of mammalian rapamycin), which is closely related to aging, is also activated to a higher degree under the stimulation of food.
The results of animal experiments will naturally extend to human beings themselves. From the point of view of disease prevention, dieting helps to prolong life. However, dieting also needs scientific guidance. If we only carry out the so-called "taking medicine to avoid the valley" for a long time, then the intake of nutrients will inevitably be unbalanced. Scientific dieting should take into account the reasonable collocation of various nutrients, and should not be neglected.