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Per 100g
Nutrition data source: USDA FoodData Central
Common measurement equivalents in grams
Yes, medium onions are very healthy. They are rich in antioxidants, which protect cells from damage, and contain compounds that may help reduce inflammation. Onions also support heart health by potentially lowering blood pressure and cholesterol, and provide prebiotics for a healthy gut.
A 100g serving of medium onion contains approximately 40 calories, 1.1g of protein, 9.3g of carbohydrates, and 0.1g of fat. They are also a good source of vitamins and minerals like Vitamin C and B6.
Yes, onions can be beneficial for weight loss due to their low calorie count and high fiber content. The fiber helps promote satiety, making you feel fuller for longer. They can add flavor to meals without significantly increasing caloric intake.
Yes, a medium onion is naturally both vegan and gluten-free. As a vegetable, it contains no animal products or gluten-containing grains, making it suitable for a wide range of dietary needs.
Onions can be included in a keto diet in moderation. While they contain carbohydrates (9.3g per 100g), small amounts used for flavoring are generally acceptable. Larger portions might contribute too many carbs, so monitor your intake.
To prepare, first trim off both ends of the onion. Then, peel away the dry outer layers of skin. You can then slice, dice, or chop the onion according to your recipe's requirements.
Yes, medium onions can be eaten raw and are often used in salads, sandwiches, and salsas for their pungent flavor and crisp texture. Raw onions retain their full nutritional profile, including beneficial sulfur compounds.
medium 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 medium onion with step-by-step instructions.
Browse recipes →Store whole, unpeeled medium onions in a cool, dry, dark, and well-ventilated place, such as a pantry or cupboard. Avoid storing them in the refrigerator, as the moisture can make them soft and spoil faster.
A fresh onion should be firm, have dry outer layers, and no visible sprouts or soft spots. Signs of spoilage include a soft or mushy texture, dark spots, mold, a strong unpleasant odor, or excessive sprouting.
Onions make you cry because they release a sulfur-containing gas called syn-propanethial-S-oxide when cut. This gas reacts with the water in your eyes, forming a mild sulfuric acid that irritates them, triggering tear production as a protective response.