What is the effect of onion on asthma?

Onion contains at least three naturally occurring anti-inflammatory substances which act at the basic cause of asthma. Persons who drank onion juice had only 50% bronchial asthma attack when exposed to irritants. Sulphur containing anti-inflammatory agent makes this possible.

Onions are also rich in quercetin, another powerful anti-inflammatory agent which can relive allergies. Moreover, it is a strong antioxidant, seems to stabilize cell membranes that releases histamine. Onions have the capacity to destroy the bacteria from the inflammation.

Hot chillies, spicy mustard, garlic and onions make breathing easier by opening up the air passages and they have also mucus moving activity which thins the mucus that otherwise plugs up the small airways, making breathing difficult for persons with asthma.

Capsaicin, the hot substance in chillies, onions and garlic has anti-inflammatory properties.

I heard from my friend that onion is not good for diabetic patients, is it correct?

Like its close cousins chives, garlic, leeks and scallions, onions is a member of the lily family, Liliaceae.

The active constituents of onion are sulphur compounds, such as allyl propyl disulphide and flavonoids, such as quercetin. Compounds from these two groups have multiple medicinal effects.

In cardiovascular diseases, cancer prevention, hyperlipedemia, Type 1 and 2 diabetes onion plays a good role. It may also help in asthma, cough, infection and hypertension.

Diabetic patients can take onions in any form, raw, cooked or fried. It is useful for your health, but it should be a part of your meals.