1. Raw onions, like onions and scallions, contain diallyl sulfide. Diallyl sulfide can stimulate the secretion of gastric juice, and help to increase appetite. At the same time, when ingested with foods with high vitamin B 1, the starch and sugar contained in vitamin B 1 will become heat, thus improving the function of fatigue recovery.
2. The onion leaf contains more vitamin A, vitamin C and calcium than the onion white. Onion contains a considerable amount of vitamin C, which can relax small blood vessels, promote blood circulation, help prevent dizziness caused by high blood pressure, keep the brain flexible and prevent Alzheimer's disease.
3. People who often eat onions, even if they are fat and fat, their cholesterol does not increase, and their physique is strong. Onion contains trace element selenium, and can reduce the content of nitrite in gastric juice, which has a certain effect on preventing gastric cancer and various cancers.
4. Onion contains volatile oil and capsaicin with pungent smell, which can get rid of the peculiar smell in greasy and thick dishes such as fishy smell, produce special aroma, and have strong bactericidal effect, which can stimulate the secretion of digestive juice and increase appetite. Volatile capsaicin can also slightly stimulate the secretion of related glands when it is excreted through sweat glands, respiratory tract and urinary system, thus playing a role in sweating, eliminating phlegm and diuresis. It is one of the traditional Chinese medicines for treating colds.
5. Onion also has the functions of lowering blood fat, blood pressure and blood sugar. If eaten with mushrooms, it can promote blood circulation.