Onions are known to be cooling in nature and can also absorb body heat hence normally suggested to eat raw during summers. Onions are also known to reduce the chances of fatality due to overheating of the body in summer. Also, Onions, especially red ones contain a flavonoid called quercetin which is believed to have an anti-histamine effect. Histamine is the irritant that causes heat rashes so eating onions daily may help to ease these summer complaints. Onion is about 85-90% water and rich in potassium and low in sodium preserving the cell water content in the body.
Onions, like other members of the allium family, are high in flavonoids and powerful antioxidants known to prevent many diseases in the body. Quercetin, which in recent studies has been shown to prevent heart disease by keeping cholesterol from attaching to the walls of our arteries and also preventing the sticking together of blood platelets and the formation of clots. A 2006 British study shows that people who eat the most quercetin-rich foods (particularly onion soup in this study) have reduced their risk of thrombosis and cardiovascular disease. Quercetin has also been used to stop tumors from growing and is often used for cancer prevention.
Other Medicinal Uses
A compress can be applied to the skin to relieve acne, arthritis and congestion
Relieves intestinal disorders
Indigestion
Headaches
Earaches
Toothache
Prevents tooth decay
Laryngitis
Colic
Angina
Jaundice
Sunstroke
Stimulating hair growth