2. Onions are nutritious and spicy. It can stimulate the secretion of stomach, intestine and digestive gland, stimulate appetite and promote digestion. Onion contains no fat, and its essential oil contains a mixture of sulfur-containing compounds, which can reduce cholesterol and can be used to treat dyspepsia, anorexia and dyspepsia.
3. Onion is the only food known to contain prostaglandin A. Prostaglandin A can dilate blood vessels and reduce blood viscosity, so it can lower blood pressure, reduce peripheral blood vessels, increase coronary blood flow and prevent thrombosis. It can resist the action of pressor substances such as catecholamine in human body, promote the excretion of sodium salt, and thus lower blood pressure. Regular consumption has a health care effect on patients with hypertension, hyperlipidemia and cardiovascular and cerebrovascular diseases;
4. Onion has a certain refreshing effect, which can help cells make better use of glucose, lower blood sugar and provide heat energy for brain cells. It is a good diet for diabetics and listless people.
Onion contains a substance called phlogiston quercitrin 9, which is one of the most effective natural anticancer substances known at present. It can prevent the variation of biochemical mechanism in vivo and control the growth of cancer cells, thus having anti-cancer and anticancer effects;
6. Selenium, a trace element contained in onion, is a strong antioxidant, which can scavenge free radicals in the body, enhance the vitality and metabolic ability of cells, and has the functions of preventing cancer and resisting aging;
7. Onions also contain a certain amount of calcium. In recent years, Swiss scientists have found that eating onions regularly can improve bone density and help prevent osteoporosis.
8. Onions contain phytoncide, such as allicin, which has strong bactericidal ability. Chewing raw onions can prevent colds.
Modern medical research also shows that onion contains trace element selenium. Selenium is an antioxidant. 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 also has the functions of eliminating phlegm, diuresis, sweating, preventing colds, inhibiting bacteria and preserving corrosion.
Onion contains sugar, protein, various inorganic salts, vitamins and other nutrients, which has a certain effect on human metabolism, can better regulate nerves and increase memory. Its volatile components also have strong effects of stimulating appetite, helping digestion and promoting absorption. Diallyl disulfide and alliin can also reduce the content of cholesterol and triglyceride in blood, thus preventing arteriosclerosis.
Onions are warm and sweet. Has expectorant, diuretic, stomach invigorating, intestine moistening, detoxicating and insecticidal effects. Can be used for treating anorexia, constipation, dysentery, enteritis, insect abdominal pain, traumatic ulcer, leucorrhea with red and white discharge, etc. Prostaglandin A contained in onion has obvious hypotensive effect, and similar substances contained in methylsulfonylurea have certain hypoglycemic effect. It can inhibit the increase of blood lipid caused by high-fat diet, and can prevent and treat arteriosclerosis. Onion extract also has bactericidal effect, which can improve gastrointestinal tension and increase digestive tract secretion. There is a peptide in onion, which can reduce the incidence of cancer.