In Europe and America, the onion, known as the "vegetable queen" of diet vegetables, has a pungent taste that makes people stay away from it, but its rich nutrition and crisp and sweet taste make people want to stop. In addition to the taste, its bulbs and leaves also contain special nutrients, which can help the weak MM resist the cold in the cold early spring. You are shivering in a coat in the chilly spring, and your girlfriend around you is still radiant in a miniskirt. Envy inevitably asks her the secret of not being afraid of cold. Would you be surprised if she said it was because she likes onions? But she didn't lie to you! Onion is such a vegetable and has many magical effects! Why eat more onions? Although onions have long been a common occurrence on our table, they can be traced back to an out-and-out "immigrant". Since ancient Egypt, it and its close relative garlic have been an important part of healthy diet and natural medicine. Onion has some unique medicinal effects, which made it play a great role in the battlefield during World War II and was used as a medicine to treat soldiers' wounds in Russian and British armies. So far, the research on the nutritional value and medicinal value of onion has never stopped. In many countries in Europe and America, onions are known as "the queen of vegetables"! It can be called "the queen of vegetables". Onion is naturally rich in nutrients, not only rich in potassium, vitamin C, folic acid, zinc, selenium, fiber and other nutrients, but also contains two special nutrients-quercetin and prostaglandin A. These two special nutrients make onion have many irreplaceable health care effects: * Preventing cancer In this society where cancer is pale, there is a food that can prevent cancer. This is really great news! More importantly, the researchers also found that onions and their families can help prevent and control various cancers. It's "various"! In France, a study on women found that women who eat more onions and garlic have a lower risk of breast cancer. I believe you will definitely add the name of onion to your menu after reading this article! The anticancer effect of onion comes from its rich selenium and quercetin. Selenium is an antioxidant, which can stimulate human immune response, thus inhibiting the division and growth of cancer cells and reducing the toxicity of carcinogens. Quercetin can inhibit the activity of carcinogenic cells and prevent the growth of cancer cells. According to a survey, people who often eat onions are 25% less likely to develop gastric cancer than those who don't, and 30% fewer people die of gastric cancer. Maintain cardiovascular health. Onion is the only known vegetable containing prostaglandin A. Prostaglandin A can dilate blood vessels and reduce blood viscosity, so it can lower blood pressure, increase coronary blood flow and prevent thrombosis. Quercetin, which is rich in onion, has high bioavailability. Scientists report that quercetin may help prevent the oxidation of low density lipoprotein (LDL) and provide important protection for atherosclerosis. * Stimulate appetite and help digestion. Onions contain allicin, which has a strong fragrance. When processing, it often makes people cry because of its pungent smell. It is this special smell that can stimulate gastric acid secretion and increase appetite. Animal experiments have also proved that onion can improve gastrointestinal tension and promote gastrointestinal peristalsis, thus playing an appetizing role, and has obvious curative effect on anorexia caused by atrophic gastritis, insufficient gastric motility and dyspepsia. Of course, if you are on a diet to lose weight, then this effect of onions is obviously not suitable for you! * Sterilization and cold prevention Onions contain phytoncide, such as allicin, which has strong bactericidal ability and can effectively resist influenza virus and prevent colds. When this phytoncide is excreted from the body through respiratory tract, urinary tract and sweat gland, it can stimulate the secretion of cell wall in these parts, so it has expectorant, diuretic, sweating, bacteriostatic and antibacterial effects. Tip: Purple onion is more nutritious. Onions can be divided into white skin, yellow skin and purple skin according to skin color. From the nutritional value, purple onion is more nutritious. This is because purple onion tastes more spicy than the other two onions, which means it contains more allicin. In addition, the purple part of purple onion contains more quercetin.