Cold sex. Most of the food ducks eat is aquatic, so their meat is sweet and cold. Duck meat is rich in B vitamins and vitamin E, and the fatty acids are mainly unsaturated fatty acids and low-carbon saturated fatty acids, which are easy to digest. Old duck soup is a famous traditional dish along the Yangtze River in Anhui Province. The main raw materials are live old duck and refined salt. The soup is clear, fragrant and delicious. Duck oil is from Huang Liang, and its meat is crisp and tender. It is a popular consumption soup pot food which integrates food health, traditional nourishing and folk dietotherapy. Old duck soup not only gives full play to the dietotherapy function of duck meat (Zantang is the best cooking method for duck meat), but also is a health-preserving delicacy respected by China people since ancient times and has a very deep market consumption base. In major cities across the country, the business of all kinds of restaurants dealing in old duck soup is extremely hot, and their "fans" include all people, men, women and children. Healthy old duck soup is a soup made of old duck and some nutritious Chinese medicines. According to Compendium of Materia Medica, duck meat has the characteristics of "sweet cold, nourishing bone marrow, promoting granulation, promoting fluid production and nourishing five internal organs", "nourishing fatigue, disinfecting and clearing away heat, facilitating urination, eliminating edema, eliminating fullness, benefiting viscera, eliminating sores and swelling, and relieving spasm and epilepsy."