Here are impressive health benefits of onion

Onions contain antioxidants and compounds that fight inflammation, decrease triglycerides and reduce cholesterol levels — all of which may lower heart disease risk. Their potent anti-inflammatory properties may also help reduce high blood pressure and protect against blood clots. Sulfides in onions contain necessary amino acids. ... Furthermore, onions contain fiber and folic acid, a B vitamin that helps the body make healthy new cells. Onions are healthy whether they're raw or cooked, though raw onions have higher levels of organic sulfur compounds that provide many benefits, according to the BBC. Onion lowers cholesterol, inhibits hardening of the arteries, enhances elasticity of blood vessels, and helps to maintain healthy blood pressure. ... In addition to limiting your intake of fats and sugars, eating onions can get your blood sugar-and your weight-on the right track. According to folk medicine proponents, attaching a slice of onion onto the feet and leaving it overnight may be effective in reducing the symptoms of fever and cold. Also, it may encourage the removal of toxins from the body.