Red and yellow onions are one of the best natural sources of quercetin, a bioflavonoid that is particularly well suited for scavenging free radicals. Aside from
its antioxidant properties, quercetin has been found to possess cancer fighting, anti-fungal, anti-bacterial, and anti-inflammatory properties. It has shown promising potential for preventing and controlling the formation of intestinal polyps, suppressing the rhinoviruses that are the underlying cause of common cold, treating psoriasis, and inhibiting the replication of viruses including the herpes simplex virus that can cause cold sores. It has also been shown to reduce the risk of stomach cancer: according to one study, half an onion a day could reduce the risk of stomach cancer by 50%. red onions provide allicin, a potent health-promoting compound that is found in onions and other members of the Allium family when the plant is crushed or chopped. Allicin has been shown to promote cardiovascular health, prevent and treat cancer, and reduce high blood pressure. It has also been suggested that allicin could be helpful for people with dandruff due to its anti-fungal properties. Onions are a rich source of chromium, a trace mineral that can help control glucose levels. This is great news for those who suffer from insulin resistance as chromium is an essential for insulin activity in carbohydrate, fat and protein metabolism. A lack of chromium-rich foods, such as onions, in diet may lead to insulin resistance and impaired blood sugar control and may increase the risk of cardiovascular disease and type 2 diabetes. Furthermore, there is some evidence suggesting that severe chromium deficiency may make weight loss more difficult or even cause weight gain. Red onions also have a low glycemic index rating of 10.
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