Onion Nutrition Facts
Everyday flavor-builder with quercetin and prebiotic fiber.
About Onion
Onions are a foundational ingredient in nearly every cuisine and a consistent EWG Clean Fifteen member thanks to their protective papery skin. They supply vitamin C, vitamin B6, and quercetin — a flavonoid with antioxidant and anti-inflammatory activity. The prebiotic fiber inulin in onions feeds beneficial gut bacteria.
Macronutrients
Per serving: 1 medium (110g)
44
Calories
1.2g
Protein
10g
Carbs
0.1g
Fat
1.9g
Fiber
Vitamins
Minerals
Fun Fact
Onions make you cry because cutting them releases sulfur compounds that react with tear fluid to form sulfuric acid.
Seasonality
Storage onions are available year-round; fresh spring and sweet onions peak March through August.
Storage Tip
Store dry yellow and red onions in a cool, dark, well-ventilated place. Keep sweet onions in the fridge and use within two weeks.
Nutrition Facts
Serving size 1 medium (110g)
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Key Highlights
- 9% Daily Value of Vitamin C
- 6% Daily Value of Manganese
- 44 calories per serving
- 1.9g of dietary fiber
Nutrition values are based on USDA FoodData Central and represent typical values per serving. Actual nutrition may vary based on variety, growing conditions, and preparation method. Percent Daily Values are based on a 2,000-calorie diet.
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