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Per 100g
Nutrition data source: USDA FoodData Central
Common measurement equivalents in grams
Yes, yellow onions are highly nutritious and rich in antioxidants like quercetin, which helps fight inflammation and supports heart health. They also contain sulfur compounds linked to anti-cancer properties and prebiotic fibers that promote digestive health.
A 100g serving of yellow 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 yet flavorful addition to meals.
Yellow onions can be included in a keto diet in moderation. While they contain 9.3g of carbs per 100g, they are typically used in small amounts as a flavor base, meaning the net carb impact per serving is usually low enough for most low-carb plans.
Yellow onions have a sharp, pungent flavor when raw but become sweet and mellow when cooked. They are considered the 'all-purpose' onion, ideal for sautéing, roasting, and caramelizing in soups, stews, and sauces.
Store yellow onions in a cool, dry, dark, and well-ventilated area, such as a pantry or a mesh bag. Avoid storing them in the refrigerator or near potatoes, as the moisture and gases can cause them to spoil or sprout faster.
Yes, you can substitute them, though the flavor profile will change slightly. White onions are sharper and crunchier, while red onions are milder and often used raw; yellow onions are generally the best choice for long cooking times due to their higher sugar content.
A fresh yellow onion should be firm with dry, papery skin. If the onion feels soft or mushy, has dark spots or visible mold, or emits a strong, unpleasant odor, it has spoiled and should be discarded.
yellow 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.
Explore more ingredients in the vegetable category with complete nutrition information.
View all vegetable →Discover 10 recipes featuring yellow onion with step-by-step instructions.
Browse recipes →Cutting onions releases sulfur-based gases that react with the moisture in your eyes to create a mild acid. To minimize tearing, try chilling the onion before cutting, using a very sharp knife to reduce cell damage, or cutting near a kitchen vent.
Yes, yellow onions are a natural, plant-based vegetable and are both 100% vegan and gluten-free. They are a safe and essential ingredient for almost all dietary restrictions.
Yellow onions are a great source of prebiotic fibers, specifically inulin. These fibers act as food for beneficial gut bacteria, which can improve digestion, enhance mineral absorption, and support a stronger immune system.
