During the restoration period can eat fruits and melons to cucumber is preferred, others, such as watermelon, apple, pear, peach, grapes, kiwi fruit, dragon fruit, etc., can be chosen, but it is best to drink only mineral water.

Long-term Valley people can take some red dates, walnuts, chestnuts, lilies, yellow essence and other dried fruits and herbs, avoid taking black bean soup and other things. At the end of the first time to eat starchy fluid food, from less and gradually increase, do not overeat and drink.

Weight can be reduced by as much as 5-15 kilograms during the period of the Valley, and some rebound after resuming the diet, but it is necessary to consciously control the weight within reasonable limits.

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The earliest record of the Valley originated from "Zhuangzi - free travel": "Contempt of the mountains of Gushu, there are gods living in. Skin like ice and snow, Nao about if the virgin, do not eat grains, suck the wind and drink dew, ride the clouds and gas, Royal Flying Dragon, and swim beyond the four seas ......" As a life-prolonging regimen, the Valley has also been documented in many ancient books and texts.

Traditionally, there are two main types of valley-opening. The main way to take the gas to avoid the valley is through fasting, adjusting the breath (breathing) way to carry out, its effectiveness is currently the lack of scientific evidence; medication to avoid the valley is not eat the main food (grains) at the same time, through the intake of other complementary food (nuts, Chinese herbs, etc.), the body functions to regulate.

Targeted in the scientific guidance of the Valley, is indeed conducive to the health of the body, but its efficacy should not be over-exaggerated, the scientific principles of which still need to be studied.

The Valley is also called but the grain, but the grain, the absolute grain, go to the grain, break the grain. Taoism believes that people eat grains and cereals, to accumulate in the intestines

Knot into feces, resulting in obscenity, hindering the path to immortality. For this reason, the Taoist priests imitated the "Zhuangzi - free travel" described "do not eat grains, sucking the wind and drinking dew," the immortal behavior, in an attempt to achieve the goal of immortality.

Ancient people also often take the grain as a health care law, the "Marrow Cleansing scripture" has "eat less and serve gas, is to enjoy the days of life," said, indicating that the grain has the role of prolonging the life; "Historical Records - Liuhou biography": "Zhang Liang sexually ill, that is, the guide does not eat the grain. " Said to guide the Valley as a method of treatment of disease. Where the practice of grain, one is to adhere to the food gas, and the second is still have to eat grain and wheat meal outside of the miscellaneous food bait.

The practice of guiding the grain began in the pre-Qin period, around the same time as the practice of qi. Set Qin and Han before the ritual of the treatise "Dai Dai Li Ji - Yi Ben Ming" said: "meat-eaters brave and tough, grain-eaters wisdom and skill, eat gas of the gods and life, do not eat the immortal and God." It is the earliest theoretical basis for the art of refraining from eating grain.

The Huainanzi - Topography Training also has a similar record. After the founding of Taoism, those who inherited the art and practiced the art of grain cultivation were not lacking in number. From the Han Dynasty to the Song Dynasty, the art of Gu Gu has been very popular within Taoism.

In 1973, two world-renowned qigong artifacts were unearthed from the Mawangdui No. 3 Han Tomb in Changsha, Hunan Province: the Guiding Diagram and the Book of Butani. The former is a colorful painting with various guiding postures; the latter is a silk book that records the specific methods of chi kung, which is the first monograph on chi kung therapy in China.

According to evidence, the silk book was written in the early Han Dynasty, around the time of Emperor Huidi of Gaozu (206-188 B.C.). The details of the book may be an ancient escapist book handed down from the pre-Qin period.

Reference link:/baike.baidu.com/item/%E8%BE%9F%E8%B0%B7 "target="_blank "title="Baidu Encyclopedia - Pai Gu" >Baidu Encyclopedia - Pai Gu