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Six Health Benefits of Onion

Updated on March 13, 2013

Onion Bulb

Health Benefits of Onion

Onion is a bulb gotten from onion plant. It has a characteristic odour and it is grown in most parts of the world. Onion is mostly used in spicing food, but it also has many other medicinal benefits not known by many people. Some of the health benefits of onion are discussed below.

  1. 1. Onion can help prevent development of cancer.

Onion has been shown to have the ability of killing cancerous cells in the test tube. Onion contains antioxidants which are able to prevent the DNA damage caused by free radicals. Also onion bulb contains organosulfur compounds that have been shown to prevent cancer in lab animals.

  1. 2. Onion helps prevent heart diseases.

Onion makes blood thin and thereby increasing proper circulation of blood in the body. Another way onion maintains a healthy heart is by lowering total blood cholesterol and help increase HDL cholesterol (good cholesterol). Onion also helps retard blood clotting. All these functions make onion a good for preventing various heart diseases. It is advisable for patients with coronary heart diseases to eat onion.

  1. 3. Onion helps in detoxification processes.

Onions contains sulphur-containing amino acids clearing the body of heavy metals. Examples of this amino acid are methionine and cystine. This makes the consumption of onion one of the natural ways of clearing your body of toxin.

  1. 4. Onion helps in treating inflammation.

Inflammation is a common problem associated with many diseases. Onion has been shown to inhibit inflammation through the inhibiting microphages functions. Microphages are specialized white blood cells that play a key role in providing immunity. One of the ways they achieve this is by triggering large-scale inflammatory responses. Some of the inflammatory responses are unwanted and must be put under control.

  1. 5. Onion has antimicrobial effects.

Onion has been shown to have antibacterial effect. It has also been shown that onion can help reduce some stomach ulcers caused by certain bacteria due to its antibacterial properties. Onion is able to kill many disease-causing pathogens, including E. coli and salmonella.

  1. 6. Onion reduces blood sugar.

Onion has been shown to have the ability of reducing blood sugar. This means onion can probably be used in management of diabetes, although more work should be done on this in order to see how a diabetic patient can benefit from eating onion.


Onion also has health benefits in the following conditions:

  • Colds
  • Obesity
  • Insomnia
  • Asthma
  • Influenza


Nutritive Values of Onions : Per 100 gm is given below


 Vitamin A : 50 I.U.

 Vitamin B :

 Vitamin C : 9 mg.

 Calcium : 32 mg.

 Phosphorus : 44 mg.

 Potassium : 300 mg.

 Carbohydrates : 10.3 gm.

 Protein : 1.4 mg.

 Calories : 45


With all these health benefits of onion, it is crucial for every cook to always include onion when cooking food. This will provide two benefits: It will add flavour to the food, and it will provide many health benefits.

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