Onion has a high nutritional value, containing 9 1g of water, 0.3g of protein 1g of fat, 5.2g of carbohydrate, 0.3g of dietary fiber/kloc-0, 60g of carotene, 0.03mg of riboflavin, 0.7mg of ascorbic acid/kloc-0, and 0.3mg of total vitamin E. In addition, onion also contains allicin, diallyl sulfur, linoleic acid, polysaccharide and so on. Its volatile components have bacteriostatic effect, and have certain curative effect on acute abdominal pain caused by common cold, ascaris lumbricoides and dyspepsia in children. Traditional Chinese medicine believes that it is pungent and warm in nature, and has the effects of publishing, relieving yang, detoxifying, publishing, activating yang, promoting blood circulation, expelling wind and stopping bleeding according to fetus. It has a good therapeutic effect on colds, wind chill and headaches.

Every100g of fresh onion contains about c8 mg of water, 1. 1 g of protein, 8. 1 g of carbohydrate, 0.9g of crude fiber, 0.2g of fat, 0.5g of ash, 0.02mg of carotene and b10. Allicin and various sulfur-containing compounds in onion can kill many bacteria and fungi in a short time. Some bioactive components in onion can promote the excretion of sodium water in kidney and have diuretic effect; Onion oil can lower blood fat; Onion has a high K factor (K-Na ratio) (33.42) and contains prostaglandin A 1, which can relax blood vessels, reduce the resistance of peripheral blood vessels and coronary vessels, and resist catecholamine substances, thus showing the effect of lowering blood pressure. Methylsulfonylurea contained in onion has the function of lowering blood sugar; Onion is rich in selenium and has anticancer effect. In recent years, medical clinic and research have proved that onion has a variety of high physiological and medicinal values. It is regarded as a multifunctional nutritional health food with blood lipid lowering, blood pressure lowering and anti-cancer in nutritious diet, and enjoys the reputation of "the queen of vegetables".

Onion is a special vegetable with nutrition, medical care and health care functions.

Onions are very nutritious,

Its hypertrophy bulb contains 8.5% sugar and 9.2% dry matter. Every 100g contains vitamin A5 mg, vitamin C9.3mg, calcium 40mg, phosphorus 50mg, iron 8mg and 18 amino acids, which is a rare health food.

Chinese and western medicine have proved that onion has the function of calming the liver and moistening the intestines, and its volatile oil contains diallyl disulfide, which is the only prostaglandin-like substance and active ingredient that can activate fibrinolysis. These substances have a strong ability to relax blood vessels and coronary arteries, and can also promote the excretion of sodium salts, thereby lowering blood pressure and preventing thrombosis.

Modern medical research also shows that onion contains trace element selenium. Selenium is an antioxidant, and its special function is to produce a large amount of glutathione. The physiological function of glutathione is to transport oxygen for cell respiration. With the increase of human selenium content, the incidence of cancer will be greatly reduced. Therefore, onion is a healthy food.

Onion also has hypoglycemic effect, because it contains organic substances similar to metsulfuron, which can produce dermatan with strong diuretic effect in human body. Eating 25 ~ 50g onion per meal for diabetic patients can play a better role in lowering blood sugar and diuresis.

Phytoncide in onion can not only stimulate appetite and help digestion, but also stimulate secretion of tube wall when it is excreted through respiratory tract, urinary tract and sweat gland, so it has the functions of eliminating phlegm, diuresis, sweating, preventing colds, bacteriostasis and antisepsis.

In addition, there is the "vegetable queen-onion", which is good for health and can also lose weight.