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4 February 2025

Guide to Understanding and Managing Bacterial Diseases Affecting Australian Vegetable Crops

Fact sheet and User guide
Pests diseases and biosecurity
4 February 2025

Fact sheet: Viruses infecting brassicas

Fact sheet
Pests diseases and biosecurity
Broccoli, Brassicas and more
3 February 2025

Fact sheet: Onions for gut health

Fact sheet
Health and nutrition
Onions and Alliums
3 February 2025

Fact sheet: Onions and diabetes management

Fact sheet
Health and nutrition
Onions and Alliums
3 February 2025

Fact sheet: Onions and low FODMAP diets

Fact sheet
Health and nutrition
Onions and Alliums
3 February 2025

Fact sheet: Onions for weight loss

Fact sheet
Health and nutrition
Onions and Alliums
3 February 2025

Fact sheet: Onions, mood, and mental health

Fact sheet
Health and nutrition
Onions and Alliums
3 February 2025

Fact sheet: Onions for heart health

Fact sheet
Health and nutrition
Onions and Alliums
3 February 2025

Fact sheet: Onions and Quercetin

Fact sheet
Health and nutrition
Onions and Alliums

Onions are a versatile vegetable that make it easy to add extra goodness to your meals. They contain a unique combination of plant compounds called flavonoids, which have antioxidant and anti-inflammatory benefits. In particular, onions are one of the richest food sources of flavonoids, specifically quercetin.

What is quercetin?

Quercetin is a powerful antioxidant that is found in plant foods, including fruit and vegetables. It has been shown to help promote a healthy heart and brain as well as reduce the risk of certain lifestyle diseases. Onions are particularly rich in quercetin – 100g of onion contains 59mg of quercetin (average of onion varieties).