Onion, also known as onion, has a history of more than 5000 years as a vegetable. Onion is rich in calcium, phosphorus, iron, vitamin b 1, vitamin C, carotene, nicotinic acid, prostaglandin A, diallyl disulfide and sulfur-containing amino acids, among which sulfur-containing amino acids have the functions of lowering blood fat and blood pressure, and prostaglandin A has the functions of dilating blood vessels, reducing blood viscosity and preventing thrombosis. Onions are also rich in trace element selenium, which can reduce the incidence of cancer. Ordinary adults eat 50-80 grams of onions raw every day, which has a very significant health care effect. It's really a "vegetable queen".

Many women don't like to mention onions because they will leave a bad taste in their mouths. However, according to nutrition experts, onions have many health functions, and the most important thing is that women can lose weight after eating them.

Onions generally have two colors, one is white and the other is purple. There is a difference between eating these two colors of onions. If you want to eat it cold and raw, you should choose white onion, because white onion contains a lot of vitamin C and carotene, which makes it feel a little sweet.

If you want to fry, you should choose purple onion, because purple onion is a bit spicy, and it may be better to fry it.

In addition, onion also has the function of lowering blood fat and blood sugar. Because it has an ingredient that can promote the metabolism of sugar and fat. However, due to the high sugar content of onion, diabetics should not eat it alone, but can use it with other vegetables, which is very beneficial to diabetics.

Eating onions every day, the original compounds contained in onions can also prevent platelet coagulation and accelerate thrombolysis. Therefore, when you enjoy high-fat food, it is best to match some onions, which will help offset the thrombosis caused by high-fat food; So it makes sense that steak is usually eaten with onions. Onion cooking is not only delicious, but also nutritious. In fact, onion is an alkaline food, which contains sugar, inorganic salts, zinc, selenium (anticancer substance), phosphorus, sulfur and so on.

Eating onions regularly has the following benefits for your health:

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

2. The sulfide contained in it can promote fat metabolism, and has the effects of reducing blood lipid and resisting arteriosclerosis. If you eat 50-70 grams of onion every day, its lipid-lowering effect is stronger than taking the antonym of lipid-lowering drugs;

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

4. Onions contain organic substances similar to the hypoglycemic drug methanesulfonic acid, which can obviously reduce the blood sugar content;

5. It contains sulfide and trace element selenium, and has inhibitory effect on gastric cancer, esophageal cancer, colon cancer and breast cancer.

6. The volatile oil contained in onions can help the elderly, and eating onions regularly can improve the quality of sexual life;

7. Onions can improve the bone density of experimental mice, and eating onions often can prevent osteoporosis;

8. Onions are rich in vitamin C and nicotinic acid, which can promote the formation of interstitial cells, repair damaged cells, and make skin smooth, ruddy, elastic and have a cosmetic effect. Contains sulfur and vitamin E, which can prevent unsaturated fatty acids from producing lipofuscin pigment and prevent senile plaque. In addition, onions contain antibacterial and anti-inflammatory substances, and eating onions can prevent enteritis and dysentery.

The difference between white onion and purple onion;

First, nutrition: white onion is better than purple onion in nutrition, especially a long white onion, which is called "health onion". Soaking purple onion with red wine has great protective and therapeutic effects on male prostate diseases.

Second, the taste: white onions are not as spicy as purple onions, but slightly sweet and thick.

Third, preservation: Because white onions are thicker than purple onions, it is relatively difficult to preserve.

Usage: Of course, they are all eaten in the stomach, but white onions are more suitable for cold dishes, not spicy or sweet. Purple onion is suitable for frying, especially with beef and bell pepper. It's also delicious to put some purple onions on the barbecue. I'll teach you a dish: beef tenderloin is fried with butter, with purple onion, red and green bell pepper and a little seed when frying.