1 serving (100 grams) contains 40 calories, 1.1 grams of protein, 0.1 grams of fat, and 9.3 grams of carbohydrates.
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Nutrition Information
Calories |
60 | ||
|---|---|---|---|
% Daily Value* |
|||
| Total Fat | 0.1 g | 0% | |
| Saturated Fat | 0 g | 0% | |
| Polyunsaturated Fat | 0 g | ||
| Cholesterol | 0 mg | 0% | |
| Sodium | 6 mg | 0% | |
| Total Carbohydrates | 13.9 g | 5% | |
| Dietary Fiber | 2.5 g | 8% | |
| Sugars | 6.3 g | ||
| protein | 1.6 g | 3% | |
| Vitamin D | 0 mcg | 0% | |
| Calcium | 34.5 mg | 2% | |
| Iron | 0.3 mg | 1% | |
| Potassium | 219 mg | 4% | |
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Food Attributes
Source of Calories
About Red onion
Red onions are a variety of onion characterized by their red-purple outer skin and white internal flesh with reddish veins. Native to Central Asia, red onions are widely used in global cuisines, including Mediterranean, Indian, Mexican, and American dishes for their mild to moderately pungent flavor. They are low in calories, with approximately 40 calories per 100 grams, and primarily composed of water (about 89%), carbohydrates, and a small amount of protein and fiber. Rich in antioxidants like quercetin, red onions also contain vitamin C, B6, and trace amounts of minerals such as potassium and manganese.
Health Benefits
- Rich in antioxidants, particularly quercetin, which supports heart health and reduces inflammation.
- Contains vitamin C, which boosts immune function and promotes collagen production for healthy skin.
- Provides manganese, an essential mineral that aids in bone health and metabolism.
Dietary Considerations
Selection and Storage
Store whole red onions in a cool, dry place with good ventilation. Once cut, refrigerate them in a sealed container for up to a week.
Common Questions About Red onion Nutrition
Is red onion high in nutritional value?
Red onions are low in calories, with about 40 calories per 100 grams, and contain 1.1 grams of protein and 9.3 grams of carbs. They are rich in antioxidants, particularly quercetin and anthocyanins, and are also a good source of vitamin C and small amounts of vitamin B6 and manganese.
Can I eat red onion on a keto diet?
Red onions can be consumed in moderation on a keto diet, as they contain about 9 grams of carbohydrates per 100 grams, with roughly 1.7 grams of fiber. They can add flavor and nutrients to dishes, but portions should be controlled to avoid exceeding daily carb limits.
What are the health benefits of red onions?
Red onions are known for their high antioxidant content, which may help reduce inflammation and support immune health. The quercetin in red onions has been linked to heart health and improved blood sugar control, while the sulfur compounds may have antibacterial properties and support overall health.
What is the recommended portion size of red onion?
A typical serving size of red onion is about 1/4 to 1/2 of a medium onion, which equals roughly 25–50 grams. This portion provides around 10–20 calories and is a great way to add flavor and nutrients to salads, sandwiches, or cooked dishes.
How does red onion compare to white onion in flavor and nutrition?
Red onions have a milder, sweeter flavor compared to white onions, making them ideal for raw dishes like salads or salsas. Nutritionally, red onions have a higher antioxidant content due to their anthocyanins, while white onions tend to be slightly less sweet and lower in these specific antioxidants.
Data Sources & Scientific References
Our nutrition data comes from trusted, authoritative sources to ensure accuracy and reliability. Below are specific scientific references and authoritative sources for this food item.
- Onions and their cancer prevention propertiesNational Library of Medicine, PubMedPeer-reviewed research discussing the bioactive compounds in onions and their role in cancer prevention.
- Flavonoids in onions and their health benefitsJournal of Food Composition and AnalysisResearch highlighting the flavonoids and antioxidant properties in onions and their impact on health.
- Dietary Guidelines for Americans, 2020-2025 - VegetablesU.S. Department of Health and Human Services (HHS) and USDADiscusses recommended vegetable intake and emphasizes onions as part of a healthy diet.
Additional Authoritative Sources:
Daily value percentages based on FDA guidelines. Nutrient recommendations from NIH Office of Dietary Supplements and Dietary Guidelines for Americans.
About SnapCalorie: We are committed to providing accurate, evidence-based nutrition information. Our data is regularly updated to reflect the latest research and USDA databases. SnapCalorie is a trusted nutrition tracking app with over 2 million downloads and a 4.8/5 star rating.
