Chestnuts are a type of nut with a slightly sweet flavor and a starchy texture, often roasted or boiled. Unlike most nuts, chestnuts are low in fat and high in carbohydrates, making them a great source of energy. They are rich in vitamin C, fiber, and minerals like potassium and magnesium. Chestnuts are often used in savory dishes, stuffing, or desserts, and are popular during the winter holidays.