What are the functions, benefits, and contraindications of black beans?

Generally speaking, the functions and benefits of black soybeans include preventing anemia, invigorating qi and nourishing the kidneys, lowering cholesterol, preventing constipation, and enhancing brain function. The contraindications include individuals with gastrointestinal discomfort, those allergic to black soybeans, gout sufferers, individuals with kidney insufficiency, and those with excessive dampness in the body. Detailed explanations are as follows:

1. Functions and Benefits

1. Preventing Anemia: Black soybeans are rich in iron, a mineral that is an essential component of hemoglobin. Consuming black soybeans allows the body to absorb sufficient iron, effectively preventing anemia.

2. Invigorating Qi and Nourishing the Kidneys: According to traditional Chinese medicine theory, black-colored foods enter the kidney meridian. As a representative of black-colored foods, black soybeans have the effects of nourishing the kidneys and improving vision and hair color. Moderate consumption of black soybeans can help alleviate symptoms of kidney deficiency.

3. Lowering Cholesterol: Black soybeans contain no cholesterol and can inhibit the body's absorption of cholesterol. By reducing cholesterol levels in the blood, black soybeans help soften blood vessels and prevent cardiovascular diseases.

4. Preventing Constipation: Black soybeans are high in dietary fiber. Regular consumption of black soybeans can promote intestinal motility, relieve internal bloating, aid in the elimination of toxins, and improve constipation symptoms.

5. Enhancing Brain Function: Black soybeans contain unsaturated fatty acids, which can be converted into lecithin in the body. Moderate consumption of black soybeans can enhance brain function, improve memory, and support cognitive development.

2. Contraindications

1. Individuals with Gastrointestinal Discomfort: Black soybeans contain a significant amount of dietary fiber. Those with weak digestive systems may experience increased gastrointestinal strain when consuming excessive amounts, leading to discomfort such as bloating and abdominal pain. Therefore, individuals with gastrointestinal issues should consume black soybeans in moderation or avoid them altogether.

2. Individuals Allergic to Black Soybeans: People with allergic constitutions may experience allergic reactions such as skin itching, swelling, or difficulty breathing after consuming black soybeans. Those allergic to black soybeans should strictly avoid consumption to prevent allergic reactions.

3. Gout Patients: Black soybeans are considered a moderate-purine food. Excessive consumption by gout patients may lead to elevated uric acid levels, worsening their condition. Therefore, gout patients should control their intake of black soybeans in moderation.

4. Individuals with Kidney Insufficiency: Black soybeans become relatively heat-inducing after being stir-fried. Excessive consumption may easily cause excessive internal heat ("fire") in the body. Therefore, stir-fried black soybeans should be consumed in moderation to avoid excessive intake that may lead to physical discomfort.

5. Individuals with Excessive Dampness: Although black soybeans have nourishing properties, they may also promote dampness and phlegm in the body. People with excessive internal dampness who consume black soybeans may experience worsened symptoms of dampness, such as body heaviness, fatigue, and edema.

Excessive consumption of black soybeans may cause bloating and discomfort. They should be consumed in moderation and thoroughly cooked to reduce the effects of anti-nutritional factors.