efficacy

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

1, cancer prevention

The anti-cancer 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 suffer from gastric cancer than those who don't, and 30% fewer people die from gastric 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, so it can reduce blood pressure, increase coronary blood flow and prevent thrombosis. Quercetin, which is rich in onion, has a high bioavailability. Scientists have reported that quercetin may help prevent the oxidation of low-density lipoprotein (LDL) and provide important protection for atherosclerosis.

onion

onion

3. Stimulate appetite and help digestion

Onion contains allicin, which has a strong aroma. When processed, 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 effects on anorexia caused by atrophic gastritis, insufficient gastric motility and dyspepsia.

4, sterilization, anti-cold

Onion contains phytoncide, such as allicin, which has strong bactericidal ability and can effectively resist influenza virus and prevent colds. When this phytoncide is excreted through respiratory tract, urinary tract and sweat gland, it can stimulate the secretion of cell pipeline wall in these positions, so it has the functions of eliminating phlegm, diuresis, sweating, bacteriostasis and antisepsis.

Tip: Purple onion is more nutritious.

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

5. Onions have a good prevention for "rich diseases"

Used for headache, stuffy nose, heavy body, aversion to cold, fever and anhidrosis caused by exogenous wind and cold. 500 ml of Coca-Cola, add onion 100g to shred, 50g of ginger to shred, and a small amount of brown sugar. Bring to a boil with slow fire for about 5min, and drink while it is hot.

In recent years, it has been found that in addition, onion can effectively prevent "rich disease". Onion contains urinary butyric acid, which can make cells make better use of sugar, thus lowering blood sugar. Onion also contains prostaglandin, which can dilate blood vessels, reduce peripheral vascular resistance, promote sodium excretion, and reduce increased blood pressure.

Onion contains a small amount of raffinose, which is a functional oligosaccharide and an important sugar for onion to resist harsh environment (cold tolerance and drought tolerance). Raffinose can proliferate human bifidobacteria, and play a role in relaxing bowels, lowering blood lipid and lowering blood pressure.

Onion also contains diallyl sulfide, which has the function of preventing arteriosclerosis and reducing blood lipid. Quercus-containing substances can also be detected in onions, and the glycoconjugates formed under the induction of flavanone have diuretic and detumescence effects, which are beneficial to the prevention of obesity, hyperlipidemia and arteriosclerosis, and are consistent with the functions of drying dampness and detoxifying onions.

6, other efficacy

Prostaglandin A contained in (1) is a strong vasodilator, which can antagonize pressor substances such as catecholamine, promote sodium excretion and lower blood pressure.

(2) Sulfide can promote fat metabolism, reduce blood lipid and prevent arteriosclerosis;

(3) Flavonoids contained in onions can reduce the viscosity of platelets, and eating onions often can prevent thrombosis and reduce the probability of myocardial infarction and cerebral thrombosis;

(4) Onion contains organic matter similar to the hypoglycemic drug mesylate, which can obviously reduce the blood sugar content;

(5) It contains sulfide and trace element selenium, which can inhibit gastric cancer, esophageal cancer, colon cancer and breast cancer.

(6) The volatile oil contained in onion can help the elderly to improve their sexual life.

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

(9) Onions are rich in vitamin C and niacin, which can promote the formation of intercellular substance and the repair of damaged cells, and make the skin smooth, ruddy and elastic, and have a cosmetic effect. It contains sulfur and vitamin E, which can prevent unsaturated fatty acids from producing lipofuscin pigment and prevent senile plaque.