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Onions are rich in nutrients, not only potassium, vitamin C, folic acid, zinc, selenium, and fiber, but also two special nutrients - quercetin and prostaglandin A. These two special nutrients make onions have many irreplaceable health effects:

1. Prevention of cancer

Onion's anti-cancer effect comes from its rich selenium and quercetin. Selenium is an antioxidant, which can stimulate the human immune response, thus inhibiting the division and growth of cancer cells, and can also reduce the toxicity of carcinogens. Quercetin can inhibit the activity of cancer cells and prevent the growth of cancer cells. A survey shows that people who often eat onions are 25% less likely to suffer from stomach cancer than those who do not eat onions, and 30% less likely to die from stomach cancer.

2. Maintain cardiovascular health

Onion is the only vegetable known to contain prostaglandin A. Prostaglandin A can dilate blood vessels and reduce blood viscosity, thus reducing blood pressure, increasing coronary blood flow and preventing thrombosis. Quercetin, which is rich in onions, has a high bioavailability. Scientists report that quercetin may help prevent the oxidation of low-density lipoprotein (LDL) and provide important protection for atherosclerosis.

3. Stimulate appetite and help digestion

Onions contain allicin, which has a strong aroma. It often makes people cry because of its pungent smell during processing. It is this special smell that can stimulate gastric acid secretion and improve appetite. Animal experiments have also proved that onions can increase gastrointestinal tension, promote gastrointestinal peristalsis, thus play an appetizing role, and have a significant effect on anorexia caused by atrophic gastritis, insufficient gastric motility, dyspepsia, etc.

4. Sterilization and cold resistance

Onions contain phytobactericides such as allicin, which has a strong bactericidal ability and can effectively resist influenza viruses and prevent colds. This plant fungicide can stimulate the secretion of the cell pipeline wall at these locations when it is discharged through the respiratory tract, urinary tract and sweat gland, so it has the functions of expectorant, diuretic, sweating, bacteriostatic and antiseptic.

Tips: purple onion has higher nutrient content

According to skin color, onions can be divided into white, yellow and purple skins. From the perspective of nutritional value, purple onion has better nutrition. This is because purple onion tastes more pungent than the other two varieties, which means it contains more allicin. In addition, the purple part of purple onion contains more quercetin.

5. Onions can prevent "wealth disease"

It is used for headache, nasal congestion, body weight, aversion to cold, fever and no sweat caused by exogenous cold. 500ml Coca Cola, add 100g onion shreds, 50g ginger shreds, and a small amount of brown sugar. Boil slowly for about 5min, and drink while hot.

In recent years, it has been found that onions can effectively prevent "wealth disease". Onions contain xanthuric butyric acid, which can make cells better use of sugar, thus reducing blood sugar. Onions also contain prostaglandins, which can dilate blood vessels, reduce peripheral vascular resistance, promote the excretion of sodium, and reduce elevated blood pressure.

Onions contain a small amount of raffinose, which is a functional oligosaccharide and an important sugar for onions to resist harsh environments (cold and drought resistance). Raffinose can proliferate bifidobacteria in human body, and play a role in moistening intestines, relieving constipation, lowering blood fat and lowering blood pressure.

Onions also contain diallyl sulfide, which can prevent vascular sclerosis and reduce blood lipids. Quercus cortex like substances can also be detected in onions. The glycoside formed under the induction of flavanone has the effect of diuresis and detumescence, which is beneficial to the prevention of obesity, hyperlipidemia, arteriosclerosis and other diseases, and is consistent with the function of onion in drying dampness and detoxification.

6. Other effects

⑴ Prostaglandin A is a strong vasodilator, which can resist catecholamine and other pressor substances, promote the excretion of sodium salt, and has the effect of lowering blood pressure;

⑵ Sulfide can promote fat metabolism, reduce blood fat and prevent arteriosclerosis;

⑶ Flavonoids contained in onions can reduce the viscosity of platelets. Eating onions regularly can prevent thrombosis and reduce the probability of myocardial infarction and cerebral thrombosis;

⑷ Onion contains organic substances similar to the antidiabetic drug methamphetamide, which can significantly reduce the blood sugar content;

⑸ Sulfide, trace element selenium, etc. can inhibit gastric cancer, esophageal cancer, colon cancer, breast cancer, etc;

(6) The volatile oil contained in onions can help sex. Eating onions regularly can improve the quality of sexual life of the elderly;

(7) Onion can increase the bone density of experimental mice, and eating onion regularly can prevent osteoporosis;

(8) Onions are rich in vitamin C and niacin, which can promote the formation of intercellular substance and the repair of damaged cells, making the skin smooth, ruddy and elastic, with cosmetic effect. The sulfur content and vitamin E can prevent unsaturated fatty acids from producing lipofuscin pigment, which can prevent senile plaque.