Black Soybean and Catfish Soup: Benefits, Recipe & TCM Guide

Introduction to Medicinal Food

“Black Bean Stewed Catfish” is a traditional Cantonese medicinal dish with a long history, and a classic soup that perfectly integrates diet with health preservation. Black beans, known in Traditional Chinese Medicine as the “Kidney’s Grain,” are neutral in nature and sweet in taste, adept at entering the Kidney Meridian. The catfish, commonly referred to as pond catfish, has tender flesh and is particularly nourishing. Combined, they are both delicious and efficacious, often regarded in folk medicine as an excellent choice for tonifying in autumn and winter or for postpartum recuperation. This medicinal dish not only warms the body and dispels cold but also subtly nourishes qi and blood in daily consumption, making it highly favored by the people of the Lingnan region.

It is worth mentioning that the history of this medicinal dish can be traced back to the accumulated experience of ancient Lingnan physicians, who discovered that black soybeans (Glycine max) and catfish (Clarias fuscus) complement each other perfectly in nature. The “stagnating” quality of black soybeans and the “cloying” nature of catfish mutually neutralize each other, making the soup both rich and easy on the stomach. Today, it has become a star dish in home soup recipes, appealing strongly to both those who are frail and frequently ill, as well as health-conscious individuals seeking delicious cuisine. A steaming bowl of this soup served at the table, with its aromatic fragrance wafting through the air, is truly the most heartwarming delicacy on a winter’s day.

Efficacy of Medicinal Diet

The primary efficacy of black soybean (Semen Sojae Nigrum) and catfish (Clarias fuscus) stew lies in tonifying the Kidneys and nourishing the Blood. Black soybeans are rich in anthocyanins and plant proteins, enabling them to enter the Kidney meridian and strengthen the marrow, while catfish contains abundant collagen and amino acids, which significantly aid in blood production and constitution enhancement. Together, they can alleviate symptoms such as soreness and weakness of the lower back and knees, dizziness and tinnitus, and a sallow complexion caused by Kidney qi deficiency. For modern people who often stay up late and overwork, this is a rare supplement for replenishing qi and blood.

Additionally, this medicinal diet also has the effects of dispelling wind and promoting diuresis, as well as strengthening sinews and bones. Black soybeans have diuretic and wind-dispelling properties that help the body expel excess dampness and reduce limb edema. Meanwhile, the collagen and calcium in catfish contribute positively to the maintenance of bones and joints. Therefore, this soup can also serve as an adjunctive therapy for relieving joint soreness and alleviating chronic edema, making it a suitable dietary choice for daily health maintenance in middle-aged and elderly individuals.

The Actions of Traditional Chinese Medicine

Nature, Flavor, and Meridian Tropism of Hei Dou (Semen Glycines Max, Black Soybean)

Black soybean (Glycine max), sweet and neutral in nature, enters the Spleen and Kidney Meridians. According to classical texts such as the *Compendium of Materia Medica* (Bencao Gangmu), black soybean invigorates blood, promotes diuresis, dispels wind, and detoxifies. Its black color corresponds to the Kidney, earning it the reputation of “tonifying the Kidney and strengthening the body.” In particular, for premature graying of hair and frequent nocturia due to Kidney yin deficiency, black soybean helps improve these conditions by supplementing Kidney essence. Additionally, it has the effect of nourishing blood and calming the Liver, making it beneficial for blurred vision and dim eyesight caused by Liver blood deficiency.

Medicinal properties of Chinese catfish (Clarias fuscus)

Catfish (Silurus asotus), neutral in nature and sweet in flavor, enters the Spleen, Stomach, and Kidney meridians. In Traditional Chinese Medicine, most fish are considered to supplement deficiency. Catfish is rich in high-quality protein that is easily absorbed, making it particularly effective for fortifying the middle and replenishing qi (Spleen & Stomach Meridians: ST, SP), nourishing yin, and opening the appetite. The mucus of catfish is abundant in various nutrients that promote mucosal repair, offering excellent recuperative benefits for epigastric discomfort and general weakness with fatigue. When simmered with black soybeans (Glycine max), which are known for their tonic properties, the “supplementing” nature of the beans and the “nourishing” quality of the catfish complement each other, jointly achieving the effect of benefiting the Kidneys and fortifying the Spleen, and strengthening the sinews and bones.

Indications

This medicinal food is most suitable for individuals with Kidney deficiency and a weak constitution, especially middle-aged or elderly people who frequently experience soreness and weakness of the lower back and knees, lack of vitality, and memory decline. The combination of black beans (Hei Dou, Glycine max), which tonify the Kidney, and catfish (Tang Shi, Clarias fuscus), which provides nourishing and strengthening properties, can significantly improve the various discomforts caused by Kidney qi deficiency. Additionally, for postpartum women with qi and blood deficiency and insufficient lactation, this soup can effectively promote lactation and nourish the blood, helping the body recover more quickly after childbirth.

Furthermore, black soybean (Semen Sojae Nigrum) stew with catfish (Clarias fuscus) is also highly suitable for office workers under long-term high-stress environments. These individuals often experience dull complexion, insomnia with dream-disturbed sleep, and gastrointestinal dysfunction due to overwork. The nourishing components in this medicinal diet can effectively tonify the Heart and Spleen, alleviating fatigue. Additionally, for sub-healthy individuals requiring auxiliary blood pressure control or presenting with mild-to-moderate edema, this medicinal dish demonstrates favorable therapeutic dietary improvement.

Contraindicated Populations

Although black soybean and catfish soup (Hei Dou Bao Tang Shi) is rich in nutrients, it is not suitable for everyone. First, individuals with severe dyspepsia or chronic diarrhea should use it with caution. Black soybeans (Sojae Semen Nigrum) contain a relatively high amount of oligosaccharides and dietary fiber, which tend to produce gas in the intestines; for those with weak Spleen and Stomach function, this may aggravate abdominal distension or diarrhea. While catfish (Clarias fuscus) has tender flesh, its oil content is slightly elevated, and excessive consumption by those with poor digestive capacity can increase the burden on the Spleen and Stomach.

Secondly, patients with high uric acid levels or gout should exercise extra caution. Catfish is classified as a moderate-purine food, and black soybeans (Glycine max) also contain a considerable amount of purines. Combining the two may increase the purine level in the soup, potentially triggering or exacerbating gout symptoms. Additionally, individuals with predominant damp-heat pattern, often presenting with a bitter taste in the mouth, dry throat, and a yellow, greasy tongue coating, are advised to consume this soup sparingly; otherwise, it may aggravate damp-heat and cause discomfort. Pregnant women should consult a qualified TCM practitioner before consumption to ensure safety.

Proportion of ingredients in the formula

Prepare a nutritionally balanced black soybean and catfish soup. Recommended precise proportions: Main ingredients: black soybeans (Glycine max) 60 g, catfish (Clarias fuscus) approximately 500 g (one medium-sized fish). Supplementary ingredients: dried tangerine peel (Citri Reticulatae Pericarpium) 2 g (about one small piece), fresh ginger (Zingiber officinale) 10 g (about 3–4 slices), scallion white (Allium fistulosum) 2 segments, cooking wine 5 ml, table salt 3 g (adjustable according to taste). Water suggested at 1500 ml, yielding a soup quantity suitable for 2 to 3 servings.

If a stronger effect of dispelling Dampness and strengthening the Spleen is desired, an additional 4 pitted red dates (Fructus Ziziphi Jujubae, approximately 15 g) and 5 g of goji berries (Fructus Lycii) can be added. Red dates tonify the Middle Jiao and boost Qi, while goji berries assist black soybeans (Semen Glycines Sojae Nigrum) in nourishing the Liver and brightening the eyes. However, it must be noted that the proportion of all ingredients should be based on preserving the original flavor of the main ingredients, without overshadowing them. If used for post-surgical or postpartum recuperation, the amount of salt added at the end may be slightly increased to balance the taste, but it should still remain light.

Preparation Method

Step 1: Ingredient Preparation

First, rinse the black soybeans thoroughly with clean water, then soak them in cold water for at least 4 hours (preferably overnight). This will soften the beans, making it easier to achieve a rich, mellow texture when cooking, while also reducing their raw taste. After slaughtering the catfish, remove the internal organs and gills, and rinse thoroughly under running water. Be sure to scrub off the slime on the fish’s surface—rub it with a little salt, then rinse with clean water to remove any fishy smell and enhance freshness.

Step Two: Pan-fry the fish and simmer the soup.

Heat oil in a wok over medium-low heat, add ginger slices (Zingiber officinale) and fry until fragrant. Place the cleaned and drained catfish whole into the wok, frying each side for about 2 minutes until the skin turns slightly golden. Splash in cooking wine to remove any fishy odor. Add the pre-soaked black soybeans (Glycine max) and tangerine peel (Citri Reticulatae Pericarpium) that has been softened in warm water, along with 1500 ml of boiling water. Bring to a boil over high heat, skimming off any foam. Then reduce to low heat, cover, and simmer for 60 to 70 minutes until the soup turns a deep, rich black.

Step 3: Flavor Adjustment and Completion

Once the cooking time is reached, open the lid and add the scallion white sections and goji berries (if using). Continue simmering over low heat for about 5 minutes. Finally, add 3 grams of salt to season, gently stir to combine, and let it come to a boil for about 30 seconds before turning off the heat. Note that salt should not be added too early, as it may affect the tenderness of the fish and the soft texture of the black beans. Remove the whole catfish and arrange it on a plate, and ladle the soup into a separate bowl. Serve and enjoy.

Consumption Tips

1. It is recommended to consume this soup on an empty stomach or semi-empty stomach before meals, as this facilitates better absorption of nutrients. It is especially suitable as a warm soup before breakfast or dinner. An intake of 200 to 300 ml per serving is ideal, taken 2 to 3 times per week. Consistent consumption for about a month may lead to noticeable improvements in constitution.

2. When consuming, avoid simultaneously eating spicy, raw, or cold foods, as well as strong tea. Spicy foods may irritate the gastrointestinal tract and impair the gentle nourishing effects of the medicinal diet; the tannic acid in strong tea can bind with the iron in black soybean (Semen Glycinae), reducing its blood-nourishing efficacy. The best accompaniment is plain rice and lightly stir-fried vegetables, which helps maximize the health benefits of the medicinal diet.

3. For individuals who need to control body weight or blood lipids, it is recommended to minimize the amount of oil used when pan-frying fish before adding it to the soup, or simply blanch the fish instead of frying to reduce fat intake. Additionally, the black soybeans (Glycine max, black soybean) and fish meat in the soup can be consumed together. However, as fish bones are numerous, caution should be taken while eating, especially for the elderly and children.