Within the polyphenol category, onions are also surprisingly high in flavonoids. For example, on an ounce-for-ounce basis, onions rank in the top 10 of commonly eaten vegetables in their quercetin content. The flavonoid content of onions can vary widely, depending on the exact variety and growing conditions.
Are onions considered a healthy food?
Onions are a root vegetable with a variety of benefits. They're high in antioxidants and sulfur-containing compounds, some of which may have a number of beneficial effects. Although more research is needed, onions have been linked to improved bone health, lower blood sugar levels, and a reduced risk of cancer.
What is unhealthy about onions?
Onions contain compounds called diallyl disulfide and lipid transfer protein, which can cause allergy symptoms like asthma, runny nose, nasal congestion, red eyes, itchy eyes and nose, and contact dermatitis, characterized by a red, itchy rash ( 9 , 10 ).
Are onions healthier raw or cooked?
Onions. According to Tufts' Health and Nutrition Letter, onions are healthy both cooked and raw, but raw onions have higher levels of sulfur compounds, which may help protect your body against cancer, reduce “bad” cholesterol production, and lower your body's blood sugar.
Which is healthier onions or garlic?
But although they may not look like nutritional powerhouses, experts say they are. Onions of all colors (including white) are good sources of vitamin C, vitamin B6, potassium and folate, while garlic is rich in vitamin C, vitamin B6, thiamin, potassium, calcium, phosphorous, copper and manganese.
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