1. Prevent cancer

The anti-cancer effect of onions comes from its rich selenium and quercetin. Selenium is an antioxidant that stimulates the body's immune response, thereby inhibiting the division and growth of cancer cells, while also reducing the toxicity of carcinogens. Quercetin can inhibit the activity of cancer cells and prevent the growth of cancer cells. A survey showed that people who eat onions often have 25% less chance of developing stomach cancer than those who don't eat, and 30% less because of stomach cancer.

2. Maintain cardiovascular health

Onions are the only vegetables known to contain prostaglandin A. Prostaglandin A can dilate blood vessels and lower blood viscosity, thus reducing blood pressure, increasing coronary blood flow, and preventing thrombosis. The quercetin, which is rich in onions, has a high bioavailability. Scientists report that quercetin may help prevent the oxidation of low-density lipoprotein (LDL) and provide important for atherosclerosis.

3. Stimulate appetite and help digestion

Onions contain onion and garlic, which has a strong aroma. When processed, the smell is pungent and often makes people cry. It is this special smell that stimulates gastric acid secretion and increases appetite. Animal experiments have also proved that onion can increase the gastrointestinal tract tension, promote gastrointestinal motility, and thus play an appetizing effect, and has obvious effects on the loss of appetite caused by atrophic gastritis, gastric motility, and indigestion.

4. Sterilization, anti-cold

Onions contain phytoncides such as allicin, which have strong bactericidal ability, can effectively resist influenza virus and prevent colds. When the phytoncide is discharged through the respiratory tract, the urinary tract, and the sweat gland, it can stimulate the secretion of the cell wall at these locations, so it has the effects of phlegm, diuresis, sweating, and antibacterial and antiseptic.

Onions are perennial herbs of the family Liliaceae and Allium. Bulbs thick, nearly globose; paper to thin leathery, endothelium hypertrophy, fleshy, leaves cylindrical, hollow, thickest in the middle, upwardly narrow, shorter than calyx, sturdy, up to 1 m tall, umbrella Inflorescences globose, many dense flowers