Onions contain caffeic acid, sinapic acid, cinnamic acid, citrate, polysaccharides and various amino acids, protein, calcium, iron, phosphorus, selenium, B vitamins, vitamin C, vitamin E, crude fiber, carbohydrates, etc. The specific nutritional value is as follows:
1. Onions have the effect of diverging wind and cold, because onion bulbs and leaves contain a kind of oily volatile compound called propylene sulfide, which has a pungent and spicy taste. This substance can resist cold and influenza virus, and has a strong effect .
2. Onions are rich in nutrients and have a pungent smell. It can stimulate the secretion of stomach, intestines and digestive glands,grow rack increase appetite and promote digestion, and onion does not contain fat. Its essential oil contains a mixture of sulfur compounds that can lower cholesterol, which can be used for constipation, loss of appetite, and internal stop of food accumulation.
3. Onions are currently known to contain prostaglandin A. Prostaglandin A can dilate blood vessels and reduce blood viscosity, thereby producing, reducing peripheral blood vessels and increasing coronary blood flow, preventing thrombosis. It resists the effects of catecholamines and other pressor substances in the human body, and can promote the excretion of sodium salts, thereby reducing blood pressure. Regular consumption has health effects on patients with high blood pressure, high blood fat and cardiovascular and cerebrovascular diseases.
4. Onion has a certain refreshing effect. It can help cells better utilize glucose, lower blood sugar at the same time, and supply heat energy to brain cells. It is a good vegetable for diet therapy for patients with diabetes and mental depression.
5. Onions contain a substance called "quercetin" 9, which is one of the most effective natural substances known so far. It can prevent the biochemical mechanism in the body from mutating, control the growth of cancer cells,microgreens shelving and thus have the effect of .
6. The trace element selenium contained in onions is a strong antioxidant, which can eliminate free radicals in the body, enhance the vitality and metabolism of cells, and have anti-aging effects.
7. Onions also contain a certain amount of calcium. In recent years, Swiss scientists have found that eating onions often can improve bone density and help prevent and treat osteoporosis.
8. Onions contain phytochemicals such as allicin, etc., so they have a strong ability to detoxify. Chewing raw onions can prevent colds.
The prostaglandin A contained in onions has a significant antihypertensive effect, and the similar substances contained in tolbutamide have a certain hypoglycemic effect. It can inhibit the increase of blood fat caused by high-fat diet, and can prevent and arteriosclerosis. Onion extract also has the effect of increasing the tension of the gastrointestinal tract and increasing the secretion of the digestive tract. There is a peptide substance in onion, which can reduce the incidence of cancer.
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