Onions are a common food. Onion is known as the "queen" in Europe and America, and has extremely high medicinal value. Eating more onions at ordinary times has a good effect on cardiovascular health. It is recommended to eat more onions in moderation. Onions are a common food. Onion is known as the "queen" in Europe and America, and has extremely high medicinal value. Eating more onions at ordinary times has a good effect on cardiovascular health. It is recommended to eat more in moderation. Onion contains prostaglandin, which plays an important role in lowering blood pressure, preventing thrombosis and protecting brain and heart. So far, scientists have found that only onions are vegetables containing prostaglandin. In Japan, onion has become a antihypertensive food for patients with hypertension. After years of research, Japanese scholars believe that long-term consumption of onions can stabilize blood pressure, reduce vascular fragility, and have a good protective effect on human arteries. Anti-arteriosclerosis, reduce thrombosis Onion contains flavonoids, which is the general name of a plant pigment and is called "quercitrin", which is particularly effective for protecting the heart. Dr. John Falk, a professor of medicine at the University of Wisconsin in the United States, believes that it is an antioxidant. It can prevent oxygen from combining with low density lipoprotein (if combined, it will adhere to the blood vessel wall and hinder blood flow). In addition, it can also reduce the viscosity of platelets. Experiments show that the viscosity of platelets can be reduced by 34% after eating onions. Eating onions for a long time can prevent arteriosclerosis and reduce vascular embolism. Onions can dispel blood clots in blood vessels. Allicin contained in onion can reduce the risk of abnormal coagulation, lower cholesterol in blood and prevent thrombosis, so it can be used to prevent arteriosclerosis and thrombosis. Hypolipidemic onion contains almost no fat, but it contains dipropyl, disulfide and active ingredients that can activate fibrinolysis. These substances are strong vasodilators, which can reduce the resistance of peripheral blood vessels and coronary arteries and have the effect of antagonizing pressor substances such as catecholamine in antibodies. Trace element selenium is an antioxidant, and its special function is to make the human body produce a lot of glutathione. The physiological function of glutathione is to transport oxygen for cell respiration. High concentration of glutathione will greatly reduce the incidence of tumors, so onion is an anti-tumor food.