Onions can protect blood vessels, with cancer prevention, sterilization and other functions, but also has the effect of beauty; contraindications: can not be eaten with honey, can not be eaten with kelp, can not be eaten with fish.

Onions can improve the intestinal environment in the body, can effectively prevent constipation. Onions are spicy and warm, can effectively prevent colds.

Onions contain prostaglandin A, a substance that can dilate human blood vessels, thereby reducing the viscosity of the blood, eat more onions on human blood vessels have a certain protective effect.

Quercetin in onions has a certain antioxidant effect, which can inhibit the activity of cancer cells and prevent the rapid growth of cancer cells. In addition, onions contain selenium, a substance that has anti-cancer components.

Onions have a certain sterilizing effect, onions contain substances such as allicin and sulfide, which have a certain sterilizing effect.

The flavonoids in onions can stimulate the secretion of estrogen in the human body. Regularly eating onions can promote the development of women's secondary sexual characteristics, you can get a better beauty effect.

Onion contraindications: onions can not be eaten with honey, because it is easy to eye discomfort; onions can not be eaten with kelp, because kelp contains a lot of iodine and calcium, onions are rich in oxalic acid, easy to eat the same cause of stones; onions and fish can not be eaten together, because fish is rich in protein, and onions are not easy to be absorbed by the body.