Chestnut kernels

Chestnut kernels

　　 Sweet and fragrant, they contain 51–60% starch, 5.7–10.7% protein, 2–7.4% fat, as well as sugars, crude fiber, carotene, vitamins A, B, C, and minerals such as calcium, phosphorus, and potassium. Up to 98% of their nutrients can be absorbed and utilized by the human body. Calculated per ten kernels, the calorie content is 204 calories, with fat content of less than 1 gram, making them the chestnut variety with the lowest fat content among shelled fruits. They are widely used in food processing, banquet cooking, and as side dishes. Chestnuts can be eaten raw or roasted; sugar-roasted chestnuts and braised chicken with chestnuts are both aromatic and delicious. They can also be ground into powder or made into a variety of dishes, pastries, canned foods, etc. Chestnuts are easy to store and preserve, which extends their market availability. Grown mostly on hillsides, they are known abroad as a “health food” and are considered an excellent fruit for improving digestion, nourishing kidneys, and promoting longevity.

Other Values

　　Chestnuts are a highly versatile food source. They can be processed into dried chestnuts, chestnut flour, chestnut jam, chestnut paste, pastries, canned goods, and more. Chestnut soup is a nutritious treat suitable for all ages. The wood of the chestnut tree is hard, straight-grained, resistant to decay and moisture, making it an excellent material for manufacturing military supplies, vehicles, ships, and furniture. However, due to the slow growth of chestnut trees, large-sized chestnut wood is very expensive.

　　The bark, leaves, and spiny burrs of the chestnut tree are rich in tannins and can be used to extract tanning agents. Its flowers are an excellent source of nectar. All parts of the chestnut tree have medicinal uses. Chestnuts can strengthen the spleen, boost qi, and eliminate damp heat. The shells are used to treat indigestion and act as an astringent. The bark, when boiled into a decoction, can be used to wash erysipelas, while the roots can treat kidney-related issues.

　　Chestnut nuts are widely used as food in Europe, Asia, and the Americas. In medieval Southern Europe, they were a primary source of carbohydrates for forest-dwelling inhabitants.

　　Chestnut wood is extremely strong and durable, resistant to corrosion, dark in color, and features beautiful grain patterns, making it an excellent material for decoration and furniture. However, because chestnut trees grow slowly, large-sized chestnut wood is very expensive.

　　Chestnut tree bark can be used to extract tannic acid and tannins, which are important raw materials in the leather industry. The leaves can be used to feed silkworms.

★ Chestnuts should not be consumed in excess. Eating too many raw can cause indigestion, while overeating cooked ones may lead to bloating. Diabetics should eat them sparingly or avoid them altogether, as chestnuts have a very high sugar content.

　　Therapeutic and Nutritional Benefits

As a food, the most popular way to enjoy chestnuts in China currently is through sugar-roasted chestnuts, where sugar and sand are mixed and the blackened sand is used to roast the chestnuts. This method ensures even heating and helps retain the chestnuts’ sugar content. The result is sweet and fragrant chestnuts. Among Beijing snacks is a small steamed cornbread made with chestnut flour, said to have originated from the imperial palace and once favored by Empress Dowager Cixi.

　　Chestnuts have the effect of nourishing the stomach, strengthening the spleen, and reinforcing the kidneys and muscles. The *Compendium of Materia Medica* states: “It has a sweet taste and warm nature, affecting the spleen, stomach, and kidney meridians.” Tang Dynasty physician Sun Simiao said: “The chestnut is the fruit of the kidney; those with kidney ailments should consume it.” The *Compendium of Materia Medica* also notes: “Chestnuts treat kidney deficiency, weakness in the waist and legs, improve kidney function and qi, and strengthen the digestive tract.” “Some people suffering from internal cold and sudden diarrhea were cured after eating just twenty or thirty roasted chestnuts.” Su Zhe, the brother of poet Su Dongpo, once wrote a poem praising the therapeutic benefits of chestnuts: “As I age, my waist and legs grow weak; the mountain elder’s chestnut remedy is time-honored. Guests are told how, morning and night, one swallows slowly the white jade nectar.” Eating chestnuts can enhance qi and blood, nourish the stomach, support the kidneys, and strengthen the liver and spleen. Eating them raw can also alleviate soreness in the waist and legs and promote circulation in the tendons and meridians. The high starch content in chestnuts provides substantial energy, while potassium helps maintain normal heart rhythm, and fiber strengthens the intestines and supports healthy bowel function.

　　Because chestnuts are rich in soft dietary fiber, they can also be consumed in moderation by diabetics. However, raw chestnuts are hard to digest, and cooked ones can cause bloating, so they should not be eaten in large quantities at once. It’s best to enjoy them as a snack between meals or include them in meals, rather than eating them in large amounts after meals to avoid excessive calorie intake that could hinder weight management. Fresh chestnuts can easily become moldy and spoiled, and eating moldy chestnuts can cause poisoning, so spoiled ones must not be consumed.

　　Traditional Chinese medicine holds that chestnuts, with their sweet and warm nature and being non-toxic, have therapeutic effects such as strengthening the spleen, nourishing the liver, building up the body, and fortifying the bones. Regular consumption raw can treat weakness in the waist and legs. The shells and bark have astringent effects; fresh leaves applied externally can treat skin inflammation; the flowers can treat scrofula and diarrhea, while the roots can address hernia. Folk remedies often use chestnuts—one or two raw chestnuts taken morning and evening daily can treat kidney deficiency and frequent urination in the elderly. Crushed raw chestnuts applied as a paste to affected areas can treat bruises, sprains, and bone and joint swelling, with pain-relieving, blood-stopping, and pus-absorbing properties.

　　Rich in starch, protein, fat, B vitamins, and various other nutrients, chestnuts are often referred to as the “king of dried fruits.” They help prevent and treat conditions such as hypertension, coronary heart disease, arteriosclerosis, and osteoporosis.

　　At the same time, regular consumption is beneficial for persistent mouth ulcers in children and oral ulcers in adults.