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White Onion — Nutrients, Health Benefits, and Shopping Tips

White onion photo

Listonic Team

September 4, 2024

White onions have a sharp, pungent flavor ideal for many culinary uses. Understand how to select and prepare white onions, learn about their health benefits, and discover the best storage practices to keep them fresh.

White onion nutrients

Check the detailed nutritional values of white onion, including information such as calories, fats, carbohydrates, and proteins per 100 grams of the product.

Nutrition facts

Amount per 100 g

Calories

🔥 40 kcal

Nutrition per: 100 g% Daily Value*
Carbs9 g3.27%
Fiber2 g7.14%
Sugars4 g8%
Glycemic Index10 -
Protein1 g2%
Sodium4 mg0.17%
Total Fat0 g-

*The % of Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Among other things, here's what makes white onion stand out:

10

🟢 Low Glycemic Index

White onion facts & tips

😋
White onions are ideal for salsas and lighter dishes.
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Store white onions in a cool, dry, well-ventilated place, away from potatoes. They can last for several weeks to a few months.

Health benefits

Understand how white onions can add flavor and nutrients to your diet.
  • Rich in antioxidants such as quercetin, which help protect the body from free radicals and reduce inflammation.
  • Supports heart health by helping to lower cholesterol levels and reduce blood pressure.
  • Contains essential vitamins and minerals such as Vitamin C, Vitamin B6, and folate, which support overall health and well-being.
  • Supports digestive health due to its fiber content, promoting regular bowel movements and a healthy gut microbiome.
  • May have antimicrobial properties, which can help fight infections and improve overall health.

Health risks

Recognize the issues related to white onion.
  • Potential for digestive discomfort such as bloating, gas, or heartburn when consumed in large quantities, particularly in raw form.
  • Risk of allergic reactions in some individuals, particularly those allergic to allium vegetables like onions, garlic, or leeks, causing symptoms like itching, swelling, or difficulty breathing.
  • Potential for strong odor which can linger on breath and skin after consumption, potentially causing social discomfort.
  • Low calorie content while generally beneficial, may not provide enough satiety when eaten alone, leading to potential overeating of other foods.
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How to choose white onion

White onions should have a bright, clean outer skin and be firm all around. The layers inside should be tightly packed and crisp when sliced, offering a sharp, slightly sweet flavor.

Do not buy white onions that have soft spots or are sprouting, as these are indications that the onion is old. Onions with a mildew smell or that are starting to decay should also be avoided.

How to choose white onion

How to store white onion

White onions should be stored in a cool, dry place with good ventilation. Keeping them in a mesh bag or a basket helps maintain their quality for up to a month.

Excess moisture can cause onions to sprout and spoil. Avoid storing them in plastic bags, which can trap moisture. Always check for any soft spots or mold before use to ensure their freshness.

✅ Extra Tip

For best results, store white onions away from potatoes, as the gases emitted by potatoes can cause onions to spoil more quickly.

How long does it last?

White onion can last for 1-2 months when stored in a cool, dark place with good ventilation. Once cut, it should be refrigerated and used within 7-10 days.

What to do with leftovers?

Leftover white onion can be used in a variety of savory dishes. Dice it and add to soups, stews, or casseroles for added flavor, or sauté it with garlic and olive oil as a base for pasta sauces, stir-fries, or rice dishes. White onion is also great when used as a topping for salads, tacos, or pizzas.

Use white onion in a quiche or frittata with eggs, cheese, and herbs, or mix it into a stuffing with breadcrumbs, herbs, and vegetables. If you have a lot of white onion, consider making a batch of caramelized onions by slowly cooking them with butter and sugar until golden and sweet. White onion can also be pickled with vinegar, sugar, and spices for a tangy condiment, or used as a filling for savory pies or turnovers. For a quick snack, enjoy white onion slices on a sandwich with cheese and cold cuts, or mix them into a dip with sour cream and herbs.

👨‍⚕️️  Medical disclaimer

The content on this website is for informational purposes only. No material on this site is intended to be a substitute for professional medical advice, diagnosis or treatment.

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