Onion is rich in a variety of nutrients, also belongs to a traditional Chinese medicine, with stomach and gas, detoxification and kill insects, lowering blood lipids, but the role of onion is relatively limited, can not be used to treat diseases, and the taste has a certain stimulating, should be appropriate to eat, not eat too much, so as not to cause discomfort, women properly eat onion benefits are as follows, not only limited to seven: 1, prevention of colds: onion contains plant bactericidal elements such as allicin The allicin has bactericidal ability, which helps to fight against cold and viruses, thus having a role in preventing colds; 2, delaying aging: onions can to a certain extent reduce protein glycation, thus assisting in slowing down the aging rate of the body. The cysteine in onion can also help to get rid of melanin, which has a certain role in promoting whitening; 3, to help digestion: onion contains garlic pungency, which can stimulate gastric acid secretion, enhance appetite, promote gastrointestinal motility, for patients with gastric power deficiency, indigestion and other symptoms can help to alleviate, but need to pay attention to gastritis, gastric ulcer patients to avoid eating, to prevent stimulation aggravated lesions; 4, to improve eye fatigue: onion contains More glutathione, can promote corneal collagen synthesis, for the maintenance of lens transparency is beneficial, to a certain extent can help improve eye fatigue; 5, improve constipation: onions in the composition and intestinal proteins or intestinal bacterial secretions combined, can form hydrogen sulfide, can promote intestinal peristalsis, thus improving the common female constipation symptoms; 6, prevent osteoporosis: onions contain dendrobium flavonoids, with Similar to the role of estrogen, onions rich in sulfide can also regulate calcium metabolism, inhibit osteolysis, increase calcium absorption, to a certain extent conducive to the prevention of osteoporosis in women; 7, regulation of blood lipids and blood pressure: onions in the sulfur amino acids and other substances, has a hypolipidemic effect, appropriate consumption of onions have a certain role in reducing the onset of cardiovascular disease. In addition, onions are also rich in prostaglandin A and calcium, which are good for dilating small blood vessels and promoting blood circulation, and to a certain extent can also assist in improving blood pressure.