1, Onion has the function of dispersing cold, because onion bulbs and leaves contain an oily volatile called propylene sulfide, which has a pungent and spicy taste. This substance can resist cold and influenza virus and has a strong bactericidal effect.

2. Onions are nutritious and spicy. It can stimulate the secretion of stomach, intestine and digestive gland, stimulate appetite and promote digestion. Onion contains no fat, and its essential oil contains a mixture of sulfur-containing compounds that can lower cholesterol, and can be used to treat dyspepsia, anorexia, indigestion and so on.

3. Onion is the only one known to contain prostaglandin A.. Prostaglandin A can dilate blood vessels and reduce blood viscosity, so it can lower blood pressure, reduce peripheral blood vessels, increase coronary blood flow and prevent thrombosis. It can resist the effect of pressor substances such as catecholamine in human body, and promote the excretion of sodium salt, thus lowering blood pressure. Regular consumption has health care effect on patients with hypertension, hyperlipidemia and cardiovascular and cerebrovascular diseases.

Disadvantages of eating onions:

1, eating onions is easy to cause eye paste and fever.

2. People with itchy skin diseases, eye diseases, stomach diseases and lung and stomach inflammation should eat less onions.

3, onion Xin Wen, patients with fever should be careful.

Extended data:

Onion contains a substance called phlogiston 9, which is one of the most effective natural anticancer substances known at present. It can prevent the variation of biochemical mechanism in the body and control the growth of cancer cells, thus having anti-cancer and anti-cancer effects. Selenium, a trace element contained in onion, is a strong antioxidant, which can eliminate free radicals in the body, enhance the vitality and metabolic ability of cells, and has the effects of preventing cancer and resisting aging.

Onions also contain a certain amount of calcium, which helps to prevent osteoporosis; Onion contains phytoncide, such as allicin, which has a strong bactericidal ability. Onion contains allicin, which has a strong aroma. When processed, 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 also prove that onion can improve gastrointestinal tension and promote gastrointestinal peristalsis. It has obvious effect on anorexia caused by atrophic gastritis, insufficient gastric motility and dyspepsia.

Onion contains phytoncide, such as allicin, which has strong bactericidal ability and can effectively resist influenza virus and prevent colds. When this phytoncide is excreted through respiratory tract, urinary tract and sweat gland, it can stimulate the secretion of cell pipeline wall in these positions, so it has the functions of eliminating phlegm, diuresis, sweating, bacteriostasis and antisepsis.

References:

Onions are good for people? Eating onions has four major effects-People's Daily Online