1, cancer prevention
The anticancer 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.
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 lower blood pressure, increase coronary blood flow and prevent thrombosis.
3. Stimulate appetite and help digestion
Onions contain allicin, which has a strong aroma. When processing, 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 curative effect on anorexia caused by atrophic gastritis, insufficient gastric motility and dyspepsia.
4, sterilization, cold
When phytoncide contained in onion is excreted through respiratory tract, urinary tract and sweat gland, it can stimulate the secretion of cell wall in these parts, so it has expectorant, diuretic, sweating, antibacterial and antiseptic effects.
5. Onion has a good preventive effect on "rich disease"
Onion contains xanthuric 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 elevated blood pressure.