Bigu means not eating whole grains. It is a systematic health-preserving method to lose weight, detoxify and preserve health by absorbing the essence of nature. This practice originated in the pre-Qin period and was popular among the people in China during the Tang Dynasty. Now it is also sought after by many people in South China and Japan. ? There are methods such as fasting abroad, all of which come from the concept of breaking the valley.

"Bi" originated in the pre-Qin period, about the same time as "Qi". The collection of etiquette works before Qin and Han Dynasties, The Core Monument of Yi Ming, said: "The meat eater is brave, and the grain eater is clever.

He who eats gas lives by God, and he who doesn't eat gas lives by God. "This is the earliest theoretical basis. There are similar records in Huainanzi Dizhi. And "the world" also contains examples. For example, in the Spring and Autumn Period, Lu Danbao lived in the deep mountains and drank streams. " I don't wear silk and hemp, I don't eat whole grains, and I wear the color of a boy. ""is the earliest broken valley practitioner recorded in historical records.

In 1973, among the silk books unearthed from Mawangdui Han Tomb in Changsha, there is an article "Going to the Valley to Eat Qi", which is the earliest extant work before the Han Dynasty. There is a cloud: "Those who go to the valley eat pyrrosia." If your head is heavy, your feet are light and you are slim, then you can cook (blow) it and see the benefits. "It means that when you first arrive in the valley, you often have top-heavy hunger and weakness of limbs, which must be overcome by' blowing' and eating gas. Here, the combination of Bi Gu and Hodge, like the deliberate combination of Hodge and Dao in Zhuangzi, seems to indicate the initial existence of these three technologies in the pre-Qin period, that is, their simultaneous appearance.

Sima Qian's Historical Records in the Western Han Dynasty recorded this valley. "After History" recorded that he was sick, and he used the technique of avoiding the valley to treat the disease and practiced the body of Homo sapiens. Since then, there have been many records. "Biography of Li Xian's Northern History" contains: "(Li Xian) has been like a day for decades, like a day for more than 90 years, as young as a child." The Biography of Chen Tuan in Song Dynasty said: "(Chen Tuan) spent more than 20 years ... he couldn't sleep for more than 100 days at a time. ..... "From 1973 to 1974, among the silk books unearthed in Mawangdui, Changsha, Hunan Province, there is a book" Eating Valley Gas ".