Chestnuts: A Few Each Day for Nourishment
During the chestnut season, sugared roasted chestnuts on the street, chestnut soup in restaurants, braised cabbage with chestnuts, and chestnut cakes in supermarkets all stimulate appetite. But what about the nutritional value of chestnuts? Dr. Fan Zhihong from the College of Food Science at China Agricultural University explains that chestnuts belong to the nut category but, unlike walnuts, hazelnuts, or almonds which are high in fat, chestnuts have very high starch content. Dry chestnuts contain up to 77% carbohydrates, comparable to grains at 75%. Fresh chestnuts contain 40%, nearly 2.4 times that of potatoes. Fresh chestnuts have a protein content of 4%–5%, slightly lower than peanuts or walnuts but higher than boiled rice.
However, chestnuts surpass grains in certain nutrients. They are rich in vitamins B1 and B2—vitamin B2 content is at least four times that of rice. Each 100 grams contains 24 mg of vitamin C, unmatched by grains. It may surprise many that fresh chestnuts contain more vitamin C than tomatoes, which are known for high vitamin C levels, let alone being over ten times richer than apples! Chestnuts also contain a wide range of minerals including potassium, magnesium, iron, zinc, and manganese. Though not as high as hazelnuts or sunflower seeds, they still far exceed apples and pears. Especially notable is their high potassium content—four times higher than apples, known for high potassium.
The glossy chestnuts also possess significant medicinal value. Chestnuts strengthen the spleen and stomach, boost qi, nourish the kidneys, and invigorate the heart. They treat conditions such as nausea, hematemesis, and bloody stools, suitable for all ages. Chestnuts are rich in soft dietary fiber, with a lower glycemic index than rice. As long as no sugar is added during cooking, diabetic patients may enjoy them in moderation.
Although chestnuts offer high nutritional and health benefits, proper consumption is essential. Dr. Fan advises: do not eat large quantities at once—overeating causes bloating. Just 6–7 chestnuts per day, consistently consumed, yield excellent tonifying effects. She also recommends eating chestnuts as snacks between meals or adding them to dishes rather than consuming them in large amounts after meals. This is because chestnuts are high in starch; eating them after meals increases calorie intake, potentially hindering weight control. Dr. Fan warns consumers: do not solely pursue bright white or golden flesh when selecting chestnuts. Golden flesh might indicate chemical treatment. Conversely, if the flesh turns slightly brown after roasting or boiling, this is due to enzymatic browning, harmless as long as the taste remains unchanged.