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Grain food is the resource for human life; lacking it for several days can lead to death. The *Bencao* (Materia Medica) contains texts on not feeling hungry, but medical prescriptions do not mention this technique. It is likely because it involves the realm of immortals and wonders, which cannot be followed by mediocre and vulgar people. Thus, in years of famine and scarcity, corpses of the starved lie across roads, which is truly lamentable. Now, I briefly record those methods that are easy to practice: if one suddenly finds oneself fleeing in uninhabited lands, or fallen into streams, valleys, empty wells, or deep tombs, looking around with no way out and nothing to eat, one must drink water and swallow Qi (vital energy). The method of swallowing Qi is as follows.

Close the mouth and use the tongue to scrape the upper and lower teeth, collect the saliva (Jin Ye), and swallow it. Swallowing three hundred and sixty times a day is good. Gradually practicing can increase this to one thousand times, naturally eliminating hunger. After three to five days, there may be slight extreme fatigue, but beyond this point, one will gradually become light and strong. There are also various methods such as consuming "Twelve Hours" and "Six Wu," but in critical situations, one may not know the directions or the time of day. Therefore, these are not discussed here. If there is water but no vessel, use the left hand to catch it. Recite: "This is the gift of the Chengyuan officials; truly lacking grain, walking in pure red-yellow, do not exceed the doctors below the city walls, to protect oneself completely." Tap the teeth three times, gesture with the right hand fingers, tap the left hand three times, repeat this three times, then drink. Afterwards, if there are cups or vessels, holding water in them is especially good. Hold with the left hand, strike the vessel with an object using the right hand according to the method, consume three sheng per day, and hunger will cease, leading to recovery.

If one can find places to roam and travel, moving between mountains and marshes:
Simply take pine needles and cypress leaves, cut them finely, and take them with water, two he. Consuming two to three sheng at noon is good. Also, dig up white cogon grass roots (Baimaogen), wash them clean, cut them, and consume them. These three substances, if obtained, can be dried in the sun, crushed on a stone, and consumed. Eating a square-inch portion allows one to fast for one day. Soybeans are also useful; select bright ones that have been heated, take them with water, and finishing them resolves hunger. For ten days, adzuki beans (Chixiaodou) are also good. Roast soybeans into powder, consume one to two sheng, allowing fasting for ten days. Herbs in the grass include Baizhu (Atractylodes macrocephala), Tianmendong (Asparagus cochinchinensis), Maimendong (Ophiopogon japonicus), Huangjing (Polygonatum sibiricum), Weirui (Anemarrhena asphodeloides), and Beimu (Fritillaria cirrhosa); whether raw or cooked, they can all be eaten alone. White bark from trees such as Zi'er, Tan, Yu, etc., can also be used to stave off hunger.

In cases of famine when grain prices are high and there is no food to sustain life, relying on medicine to save life is necessary:
Take one dou of rice, rinse it thoroughly, steam it one hundred times, dry it one hundred times, crush it, and eat one meal a day. With just water, stopping all other food intake for thirty days allows one to never eat again for life, walking three hundred li per day.

Another prescription: Take one dou of jingmi (Indica rice), soak it in three sheng of wine, take it out and dry it, then soak it again until the wine is exhausted. Take it out, eat small amounts occasionally, and drink when thirsty. This allows fasting for thirty days; one hu and two sheng is sufficient to fast for a full year.

There is also a method for making Shouzhong Wan (Preserving the Middle Pill).
The various grains and beans listed are easily obtained and made by humans, and they do not violate the Qi of grains, ensuring physical strength remains undiminished. Perhaps bodies impure with meat cannot suddenly rely solely on medicinal substances and might not endure it.
If one can frequently manage and procure these, self-renewal will occur; seek them in my compiled Grain Prescriptions.

Attached Prescriptions:
*Shenghui Fang* Method for Fasting and Ascending to Immortality without Eating:
Take pine nuts, crush them into a paste, mix with wine, and ingest three qian. Three times a day eliminates hunger. Drink water when thirsty, do not eat other things. After one hundred days, the body becomes light, walking five hundred li per day.

Wild tales say: Master Fuhu's method of refining Pine Resin (Songzhi):
Ten jin of pine resin, boiled in water five times until the bitter taste is gone. For every one jin of refined resin, add four liang of Poria cocos (Fuling) powder. Ingest one Dao Gui with water every morning. One can fast for a whole year, extend lifespan, and feel light and refreshed.

Baopuzi says:
During the reign of Emperor Cheng of Han, hunters in Zhongnan Mountain saw a person without clothes, covered in black hair, jumping over pits and crossing streams like flying. They secretly watched his location, surrounded him, and captured him. It was a woman. When asked, she said, "I am a palace maid from Qin. When rebels from east of the pass arrived and the King of Qin surrendered, I fled in fear into the mountains. Starving with no food, I was about to die of hunger. An old man taught me to eat pine and cypress leaves and fruits. At first, they were bitter, but later became easier to eat, and thus I no longer felt hunger. I did not feel cold in winter nor hot in summer." This woman was from the Qin dynasty; by the time of Emperor Cheng of Han, more than three hundred years had passed.