Fasting was originally a way of practice in ancient religions, and practitioners improved their spiritual realm through fasting. Interestingly, many animals also have this phenomenon in their lives, such as hibernating hedgehogs and cats that "fast" for one day every once in a while. But I have never heard that they will starve to death like this, but fasting will make them more active and even better. We belong to the category of "animals". During fasting, the organs in the body will regulate themselves. Without the fetters of food, the intestines and stomach can also take a big vacation and have a good rest, so that the energy in the body can exert its maximum excretion to excrete toxins.

There is a saying in ancient times called Gu Po! This is the law.

Bigu is also called "sparrow valley", "broken valley", "no valley", "no valley" and "no valley", which means you don't eat whole grains.

Taoism follows that people eat whole grains and accumulate feces in their intestines, which will produce foul smell and hinder the road to immortality. "Huang Tingnei"

Jing Ke said, "The earth is the essence of a hundred grains, evil smells five flavors, and the sacred thing of God is zero. So, how can we change from old to baby? "

(1) At the same time, there are three worms (three corpses) in the human body, and they live on this grain gas. With its existence, people have evil desires.

And you cann't live forever Therefore, if you want to clear the dirty gas in the intestine and get rid of the three corpse worms, you must break the valley. To this end, Taoist priests imitate Zhuangzi.

The immortal behavior of "not eating grains, sucking wind and drinking dew" described in Xiaoyao Tour seeks to achieve the goal of immortality.

Begging for grain originated in the pre-Qin period, and it was about the same time as qi-moving. Yi Yisheng's core monument, a collection of etiquette works before Qin and Han Dynasties.

He said: "Carnivores are brave, grain eaters are wise, gas eaters live like gods, and non-eaters die like gods." ② Yes.

It is the earliest theoretical basis of the art of crossing the valley. There are similar records in Huainanzi Dizhi. And "the world" also contains examples.

For example, in the Spring and Autumn Period, a single leopard in Lu lived in the mountains and drank streams. "I don't wear silk and hemp, I don't eat whole grains, and I am still alive at the age of seventy."

There are boys' colors. (3) is the earliest practitioner in Historical Records. 1973 silk unearthed from mawangdui Han tomb in Changsha

There is "Going to the Valley to Eat Qi" in the book, which is the earliest existing work in the pre-Qin period. There is a cloud: "Go (but)."

People in the valley eat pyrrosia. ..... Pay attention to your feet and body first, and then cook (blow), depending on the benefit. "It means the first monarch.

In the valley, there is often a phenomenon of top-heavy and weak limbs, which must be overcome by "blowing". There will be a monarch here.

The combination of valley and qi circulation, like the deliberate combination of qi circulation and qi guidance in Zhuangzi, seems to indicate the existence of these three techniques.

The initial state of existence in the pre-Qin period shows that they appeared at roughly the same time.