Liliaceae onion herb, also known as onions, onions and other ball, biennial or perennial, is a very common cheap dishes. West Asian origin, are cultivated all over the country, four have a supply. Parts of onions for food underground bulb hypertrophy (ie onion), because onions first produced in the desert, surrounded by water in order to live, so long layers of scales. Can be classified according to their skin color, white, yellow and red in three ways: a small white bulb types, looks white or greenish, meat tender, juicy and spicy leaves light, good quality, suitable for eating raw.
The strong aroma of onion, nutritious, containing vitamins A, B, C and phosphorus, iron, calcium and minerals, with divergent cold effect, because onion bulbs and leaves contain oil volatiles called propylene sulfide, with Sim Jane spicy, this substance can cold, against influenza virus, there is a strong bactericidal effect; onion nutritious, and pungent odor. Can irritate the stomach, intestines and digestive gland secretion, increase appetite, promote digestion, fat-free and onion, which contains essential oils can reduce cholesterol in a mixture of sulfur-containing compounds can be used to treat indigestion, loss of appetite, food product within the stop embolism ; onion is currently known only with prostaglandin a's. Prostaglandin A can expand blood vessels, reducing blood viscosity, and thus will have lower blood pressure, reduce peripheral vascular and increase coronary blood flow, prevention of thrombosis. The role of catecholamines in the human body against substances such as boost, but also to promote the excretion of sodium, so that blood pressure, regular consumption of high blood pressure, high cholesterol and cardiovascular disease has a role in health care; Onions also contain some calcium in recent years, the Swiss scientists have discovered eat onions can increase bone density and help prevent osteoporosis; onion plants containing spinosad as allicin, and thus has a strong bactericidal capacity. Chewing raw onion can prevent colds.