Onion: The benefits and its health risks

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Slicing onions makes you cry because when you cut it, the onion produces a sulfur-based gas. Next time, try moving your face farther away from the onion so the gas disperses before reaching your eyes.
      Nevertheless, onions probably originated in central Asia, in modern-day Iran and Pakistan. Onions may have been among the earliest cultivated crops! Onions encourage a healthy heart in many ways, including "lowering blood pressure and lowering heart attack risk." A 2002 study in the journal Thrombosis Research suggested that sulfur acts as a natural blood thinner and prevents blood platelets from aggregating. 
Its benefits
Immune system
"The polyphenols in onions act as antioxidants, protecting the body against free radicals," said Anne Mauney, a dietitian based in Washington, D.C. Eliminating free radicals can help encourage a strong immune system. 
Cancer
The National Onion Association discussed a recent study from the Netherlands that showed that people who ate onions absorbed twice as much quercetin as those who drank tea, and more than three times as much quercetin as those who ate apples, which are other high-quercetin sources. Red onions are especially high in quercetin over other varieties, according to the association.
Regulating blood sugar
The chromium in onions assists in regulating blood sugar. The sulfur in onions helps lower blood sugar by triggering increased insulin production . One 2010 study in the journal Environmental Health Insights revealed that this might be especially helpful to people with people with diabetes. People with Type 1 and Type 2 diabetes who ate red onions showed lower glucose levels for up to four hours.
Bone density in older women
A 2009 study in the journal Menopause found that daily consumption of onions improves bone density in women who are going through or have finished menopause. Women who ate onions frequently had a 20 percent lower risk of hip fracture than those who never ate onions.
Its effects in the system. 
   While not especially serious, eating onions can cause problems for some people. The carbohydrates in onions may cause gas and bloating, according to National Digestive Diseases Information Clearinghouse. Onions, especially if consumed raw, can worsen heartburn in people who suffer from chronic heartburn or gastric reflux disease, according to one 1990 study in the American Journal of Gastroenterology.
      Eating a large amount of green onions or rapidly increasing your consumption of green onions may interfere with blood thinning drugs , according to the University of Georgia. Green onions contain high amount of vitamin K, which can decrease blood thinner functioning.
     It is also possible to have a food intolerance or an allergy to onions, but cases are rare, according to an article in the Journal of Allergy and Clinical Immunology. People with onion allergies may experience red, itchy eyes and rashes if an onion comes into contact with the skin. People with an intolerance to onions may experience nausea, vomiting and other gastric discomfort.
  Lastly, we encourage people to make sure their onions are fresh.

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