Scientists have linked onions to many potential health benefits, most of which come from the antioxidants they contain. Antioxidants prevent cell damage in your body. Research shows that an antioxidant called quercetin protects health in several ways, including fighting inflammation and boosting the immune system.
Low risk of ovarian cancer
Many types of onions contain chemicals that can fight cancer.
A study found that people who eat the most onions have the least incidence of colon, esophageal, and ovarian cancer. Another showed that men who ate the most cruciferous vegetables had the least incidence of prostate cancer.
Some researchers believe that onion quercetin and other antioxidants are responsible for its anti-cancer properties. A diet rich in quercetin has been linked to an increased risk of lung cancer.
Antibacterial effect
According to some laboratory studies, onions can kill many bacteria. More research is needed to show how onions affect bacteria in the body.
Digestive health
Fructooligosaccharides in onions, substances that act as prebiotics (food for healthy gut bacteria), can help in digestion. They pass through the intestines and feed healthy bacteria in the large intestine.
Diseases ranging from diabetes to colon cancer and depression are linked to a lack of healthy gut bacteria.
Bone health
Onions can play a role in preventing osteoporosis, which weakens your bones. A study on people near or past menopause found that those who eat onions every day have higher bone density and stronger bones.
Lower risk of heart disease and stroke
Onions contain organic sulfur compounds, which give them a sharp, strong taste and smell. These compounds can help lower the body’s cholesterol levels and reduce the risk of heart disease and stroke by helping to break down blood vessels.
To get the most sulfur compounds from them, you should eat onions raw, not cooked.
Diabetes control
The compounds quercetin and organic sulfur found in onions increase insulin production and help choose vegetables if you have diabetes.
Lower risk of Alzheimer’s disease
A study found that a high intake of flavonoids reduces the risk of Alzheimer’s disease.
What is onion for hair?
Some people use onion juice as a home remedy for hair loss, dandruff, scalp irritation and other hair related problems. But there is little research on the potential benefits. A small study found possible benefits in people with hair loss due to an immune disorder called alopecia areata. In the study, people who washed their hair with onion juice grew more hair than those who washed their hair with water.
