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Per 100g
Nutrition data source: USDA FoodData Central
Common measurement equivalents in grams
Yes, raw red onions are highly nutritious and rich in antioxidants like quercetin and anthocyanins, which help reduce inflammation. They also provide Vitamin C for immune support and sulfur compounds that may benefit heart health and lower cholesterol.
A 100g serving of raw red onion contains approximately 40 calories and 9.3g of carbohydrates. They are very low in fat (0.1g) and provide about 1.1g of protein, making them a light addition to most meals.
Red onions can be included in a keto diet when consumed in moderation. While they contain about 9.3g of carbs per 100g, the typical serving size used in salads or as a garnish is small enough to fit within daily carbohydrate limits.
Red onions are a good source of prebiotic fiber, which serves as fuel for beneficial gut bacteria. This promotes a healthy microbiome and supports overall digestive health and regularity.
To mellow the pungent flavor of raw red onions, soak the slices in a bowl of ice water or a light vinegar solution for 10 to 15 minutes. This removes some of the sulfur compounds responsible for the sharp taste while keeping the onion crunchy.
Red onions have a milder, sweeter flavor and are higher in antioxidants like anthocyanins, which provide their purple color. While white onions are often used for cooking due to their sharp flavor, red onions are the preferred choice for raw applications like salads and sandwiches.
Whole red onions should be stored in a cool, dry, and well-ventilated area away from sunlight, where they can last for several months. Once cut, they must be stored in an airtight container in the refrigerator and used within 7 to 10 days.
raw red onion is a versatile ingredient found in cuisines around the world. With 40 calories per 100g and 1.1 grams of protein, it's a nutritious addition to many dishes.
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Browse recipes →A fresh red onion should be firm with dry, papery skin. If the onion feels soft or mushy, shows signs of mold, or has a strong, unpleasant odor, it has spoiled and should be discarded.
Yes, red onions are safe and very common to eat raw. Eating them raw preserves heat-sensitive nutrients like Vitamin C and certain sulfur compounds that may be diminished during the cooking process.
Red onions are excellent for weight loss because they are low in calories but high in flavor and fiber. They can help make meals more satisfying without adding significant fat or calories.