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(Shudou) Dispersing and promoting the spleen and stomach to treat swallowed needles
Canvabean (specifically enters the Spleen and Stomach meridians). Its taste is sweet, and its nature is warm. According to records in books, consuming too much of this can lead to qi stagnation. It is also said that if an iron needle is accidentally swallowed, eating canvabeans will cause it to pass out. This is because when humans ingest grain food, they must rely on Middle Qi (the vital energy of the middle jiao responsible for digestion and transportation) for metabolism and distribution. If Middle Qi is slightly invigorated, even if solid foreign objects obstruct the intestines and stomach, administering canvabeans together with warming herbs can resolve the obstruction. (Jishantang Formula: A young woman accidentally swallowed a needle into her abdomen, which physicians could not treat. Someone advised boiling canvabeans and eating them with Chinese chives; the needle was subsequently passed out with the stool. For those who accidentally ingested gold or silver objects, this method is also effective, verifying its nature's ability to promote the functioning of the zang-fu organs.) However, if one's Middle Qi is already deficient, slight consumption leading to dampness and stagnation can cause abdominal distension. How much more so with excessive consumption? This explains why there are differing views on whether canvabeans "promote" or "do not promote." Nevertheless, since it can facilitate the expulsion of needles, its dispersing and promoting nature is evident. This is absolutely different from yin-nourishing substances that tend to cause stagnation when encountering the human body. The distinction lies in observing the patient's constitutional qi during clinical practice and adjusting based on whether consumed in large or small amounts.

(Shudou) Promoting the stomach, benefiting the intestines, activating blood, and entering the Kidney to treat Gui Zhu (demonic lingering diseases)
White bean (specifically enters the Intestines, Stomach, and Kidney meridians). It refers to the white variety of small beans among rice beans. (There are also earth-yellow varieties, with beans as large as mung beans but longer, planted in April and May. The seedlings and leaves resemble those of Adzuki beans but are slightly larger, and are edible.) Its aroma and taste are sweet and neutral, non-toxic. According to book records, it is suitable for Kidney diseases, can tonify the five zang organs, warm the intestines and stomach, benefit qi and harmonize the middle jiao, and regulate the meridians. Generally, substances with large volume have floating qi, while those with small volume have sinking qi; sweet taste tends to stay in the center, and salty taste enters the Kidney. White beans are small in volume and sweet in taste, thus they can enter the Kidney to treat Gui Zhu (chronic debilitating diseases attributed to pathogenic factors), enter the blood to regulate menstruation, and enter the Large Intestine and Stomach to benefit and harmonize Middle Qi. However, they must be stir-fried until hot before consumption to show efficacy. If taken raw, would it not likely cause symptoms such as vomiting, diarrhea, and damage to the Middle Qi? Careful consideration is required.

(Shudou) Benefiting the intestines and stomach by draining dampness and clearing heat
Pea (specifically enters the Spleen and Stomach meridians). Also known as Cold Bean. (Also called Bi Dou or Hu Dou.) Its taste is sweet, its nature is neutral, and it is non-toxic. Therefore, books record it as entering the Spleen and Stomach meridians, capable of draining dampness and clearing heat. It is most suitable for individuals suffering from diseases caused by damp-heat, presenting with symptoms such as abdominal distension, polydipsia, urinary retention, alternating chills and fever, heat in the middle causing vomiting, nausea, and diarrhea. For conditions caused by damp-heat presenting with pustules or carbuncles that are purple-black and swollen, or blackened and foul-smelling, or having purple lines in the center, treatment with peas is invariably effective. (Niu Yushi's Four Sages Pill: Roast 49 peas until carbonized but retaining their nature, mix with 3 fen of hair ash and 14 pearls, grind into powder, and mash with oil-based rouge to form a paste. First, pierce the pustule/carbuncle with a hairpin to drain the bad blood, then apply a small amount of the paste. The lesion immediately turns red and vibrant.) Alternatively, for abdominal distension due to qi deficiency, cooking peas with lamb meat can also achieve therapeutic effects. This is because this bean belongs to Earth, so its treatment targets diseases of the Spleen and Stomach. However, adjuvant herbs are necessary; for example, to treat pustules/carbuncles by entering muscles and activating blood, Rouge (Carthami Flos) must be added; to tonify qi in the Spleen and Stomach, Lamb meat must be added. Each combination has profound rationale and cannot be achieved by Peas alone. The authentic variety comes from Hu regions and is as large as apricot kernels.