Pigu, often associated with persuasion, is called convincing to Pigu. Being convinced, as the name implies, is to take qi. After being influenced by Taoist thought, it is called taking essence or taking qi. This is the practice of replacing food with qi, and the method of breaking the valley with conviction is always emphasized by Taoism. Since the Han Dynasty, there has been a legend that Taoist priests were persuaded to break the valley, and there were also many imitators in previous dynasties.
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At the same time, Taoists especially emphasize the addition of supplementary foods, such as Poria cocos, jujube, flax and Polygonatum. These medicines are evaporated for nine times by the preparation method of traditional Chinese medicine, and made into watered pills, honeyed pills, ointments, or compounds, and made into "Taiqing Jinye Ointment", "Poria Ointment" and "Flax Rice", which can be taken at any time.
For example, in the Jin Dynasty, the people and musicians circulated the "method of gargling and swallowing huachi": it often contained jujube stones. If a child sucks milk, it will be full for a long time. Swallow three points and leave two points. Swallowing can be repeated. Another example is the method of promoting breaking the valley quoted by Mr. Jing Hei in the Sui Dynasty in the Record of Food and Gas in the Golden Chamber: first introduce it by mouth, then swallow it, to 360. The more you swallow like this, the better. When practicing this method, if you swallow and eat, you should reduce one meal a day and not eat after ten days.
From then on, qi often can't get in, and God is always full. If you feel hungry or your urine is red and yellow, eat nine dates. Eat one or two when you are hungry, one day and one night, but these nine dates. Don't miss food, no dates.
Exercisers often contain jujube stones, which is more beneficial to the body fluid in the mouth. According to the records of these prescriptions, it can be seen that the Taoist taboo is not to eat whole grains, but to eat protein and high-fat drugs to nourish the qi and blood of the human body and enrich life elements.