Introduction: Commonly known as horseshoe, also known as ground chestnut, it is named because it is shaped like a horseshoe and like a chestnut. Calling it horseshoe only refers to its appearance; saying it resembles a chestnut means not only its shape, but also its nature, flavor, ingredients, and functions. Also, because it bears fruit in mud, it is also called ground chestnut. Water chestnuts have purple-black skin, white meat, sweet and juicy taste, crisp and delicious. They have been known as underground snow pears since ancient times, and northerners regard them as Jiangnan ginseng. Water chestnuts can be both a fruit and a vegetable, and are a popular seasonal product. Efficacy: Water chestnuts contain the highest phosphorus among root vegetables, which can promote human growth and development and maintain physiological functions. It is of great benefit to the development of teeth and bones. It can also promote the metabolism of sugar, fat, and protein in the body and regulate Acid-base balance. Therefore, water chestnuts are suitable for children to eat. In the study of water chestnuts, the United Kingdom discovered an antibacterial ingredient called water chestnut. This substance has a certain inhibitory effect on Staphylococcus aureus, Escherichia coli, Escherichia coli, and Pseudomonas aeruginosa, and it also has a certain effect on lowering blood pressure. This substance also has a preventive and therapeutic effect on cancers of the lungs, esophagus and breast. Water chestnuts also have the function of preventing acute infectious diseases. In Chunxiu, where measles and meningococcal meningitis are more likely to occur, water chestnuts are a good disease prevention food. Water chestnuts are cold food and have the good effect of clearing away heat and purging fire. It can not only clear away heat and promote fluid production, but also supplement nutrition. It is most suitable for patients with fever. It has the effects of cooling blood and detoxifying, diuretic and laxative, resolving dampness and eliminating phlegm, eliminating food and removing swelling. Suitable for the crowd: It is a popular food. It is most suitable for children and patients with fever. Applicable amount: about 10 pieces each time. Warm reminder: Water chestnuts should not be eaten raw, because water chestnuts grow in mud, and there may be more bacteria and parasites attached to the outside and inside. Therefore, they must be washed and cooked thoroughly before eating, and cooked water chestnuts are sweeter. Water chestnuts are raw and cold foods, which are not suitable for people with spleen and kidney deficiency and blood stasis.