Crabs, also known as river crabs, are migratory crustacean aquatic animals (crabs breed in the ocean and grow in freshwater rivers, rivers, and lakes. When mature, crabs return to seawater to breed). Crab, as a delicacy, has been favored by people since ancient times. Li Shizhen in the Ming Dynasty praised: "Fresh crabs are mixed with ginger vinegar, mellow wine, chewing yellow crabs, and you can enjoy the flavor." Li Yu in the Qing Dynasty even called crabs: "The color, aroma, and taste have been created to the extreme, and there is nothing that can be tasted." "Therefore, it is known as "Crabs on a dinner table with a hundred flavors". Crabs are rich in nutrients and contain a variety of vitamins. Vitamin A is higher than other terrestrial and aquatic animals. Vitamin B2 is 5-6 times higher than meat, 6-10 times higher than fish, and 2-3 times higher than eggs. times. The content of vitamin B1 and phosphorus is 6-10 times higher than that of ordinary fish. Each 100 grams of edible crab contains 17.5 grams of protein, 2.8 grams of fat, 182 mg of phosphorus, 126 mg of calcium, and 2.8 mg of iron. In addition to being rich in calcium, crab shells also contain crab erythrin, crab xanthin, etc. Crabs are not only a delicacy in food, but also have miraculous medicinal properties. "Compendium of Materia Medica" says: "Its function is not only for dispersing, but also for harmonizing blood." Traditional Chinese medicine believes that crabs are cold in nature and salty in taste. Crab meat has the functions of clearing away heat, dissipating blood knots, treating injuries, regulating meridians and nourishing yin. The shell can clear away heat and detoxify, break up silt and relieve pain. Modern research has found that crab shells contain a substance - chitin. A substance called ACOS-6 can be extracted from chitin, which has low toxicity and immune-activating properties. Animal experiments have confirmed that this substance can inhibit cancer cells. proliferation and metastasis. References: