How Many Calories Are in a Yellow Onion?
Yellow onions are naturally low in calories. The exact amount depends on onion size and weight. A medium raw yellow onion contains about 54 calories when it weighs 143 grams.
Calories in 1 Medium Yellow Onion
One medium yellow onion contains about 54 calories. This amount refers to the edible portion, without the papery skin. The USDA-based serving weighs about 143 grams.
Yellow Onion Calories per 100g
Raw yellow onion provides about 38 calories per 100 grams. It contains around 8.6 grams of carbohydrates and 0.8 grams of protein. It also has very little fat, with about 0.1 grams per 100 grams.
Carbs and Fiber
Yellow onions mainly provide carbohydrates, with small amounts of fiber. One hundred grams contains about 8.6 grams of carbohydrates. It also provides around 1.7 grams of dietary fiber. The remaining carbohydrates include naturally occurring sugars. Onions can add flavor while keeping meals relatively low in calories.
Protein, Fat, Vitamins, and Minerals
Yellow onions contain small amounts of protein and very little fat. One hundred grams provides about 1.1 grams of protein and 0.1 grams of fat. They also provide several vitamins and minerals in smaller amounts. These include vitamin C, vitamin B6, folate, potassium, and manganese.
Onions also contain natural plant compounds, including antioxidant compounds. Their nutrient amounts can vary slightly by variety and growing conditions. USDA FoodData Central regularly updates its food composition information.
Yellow Onion Calories by Serving Size
Small, Medium, and Large Onion
Calories vary depending on the onion’s size and weight. A small onion has about 28 calories. A medium onion has about 44 calories. A large onion has about 60 calories. These values use common USDA serving weights for raw onions.
Sliced Yellow Onion
Sliced onion calories depend on the amount you use. One hundred grams contains about 38 calories. A cup of chopped raw onion weighs about 160 grams. That serving provides roughly 61 calories.
Raw vs. Cooked Yellow Onion Calories
| Type | Serving Size | Calories |
|---|---|---|
| Raw yellow onion | 100g | ~38 calories |
| Boiled yellow onion | 100g | ~40 calories |
| Sautéed yellow onion | 100g | Varies with oil |
| Fried yellow onion | 100g | Higher due to added fat |
Calories Can Change With Cooking
Cooking without added fat keeps yellow onions relatively low in calories. Oil and butter add extra calories quickly. The final amount depends on how much cooking fat you use.
Health Benefits of Yellow Onions
Antioxidants and Plant Compounds
Yellow onions contain plant compounds called flavonoids. They also provide quercetin, a naturally occurring antioxidant. These compounds help protect cells from oxidative stress. Onions contain several other plant compounds in smaller amounts.
Fiber and Heart Health
Yellow onions provide dietary fiber that supports normal digestive health. Fiber can help maintain regular bowel movements. Onions also contain potassium, vitamin C, and other nutrients.
Their plant compounds may also support overall heart health. However, onions alone cannot prevent or treat heart disease. A balanced diet matters more for long-term heart health. Onions can easily fit into that healthy eating pattern. They add flavor without adding many calories.
Yellow onions also contain sulfur compounds and other bioactive substances. Research continues to study their possible health effects. Nutrient amounts can vary between onion varieties and growing conditions.
Are Yellow Onions Good for Weight Management?
Yellow onions can fit well into a balanced eating pattern. They provide relatively few calories for their volume. Raw onions contain about 38 calories per 100 grams.
They also provide dietary fiber, which supports healthy digestion. Fiber can help make meals more satisfying when included with other foods. However, onions do not directly cause weight loss.
How you prepare them also matters. Adding lots of oil, butter, or creamy sauces increases calories. Using onions to add flavor can help create tasty meals without relying heavily on high-calorie ingredients. Overall, yellow onions are a nutritious, low-calorie vegetable that can fit into balanced meals.
Frequently Asked Questions About Yellow Onion Calories
Are yellow onions high in calories?
No, yellow onions are relatively low in calories. Raw yellow onions provide about 38 calories per 100 grams.
How many calories are in 100g of yellow onion?
One hundred grams of raw yellow onion contains about 38 calories. It also provides carbohydrates, fiber, and small amounts of protein.
How many calories are in one medium yellow onion?
A medium raw onion contains about 44 calories. This estimate uses a medium onion weighing approximately 110 grams.
Do cooked onions have more calories?
Cooking alone does not always add many calories to onions. However, frying or sautéing can increase calories significantly. Added oil or butter contributes most of the extra calories.
Conclusion
Yellow onions are a low-calorie vegetable that fits many balanced meals. Raw yellow onion contains about 38 calories per 100 grams. A whole edible onion weighing 143 grams provides about 54 calories.
They also provide carbohydrates, fiber, vitamin C, and potassium. Cooking methods can change the final calorie content. Added oil or butter can increase calories significantly. Choosing simple cooking methods keeps onions a lighter meal ingredient. Overall, yellow onions offer useful nutrients with relatively few calories. They can add flavor, texture, and nutrition to everyday meals.
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Disclaimer:This article is for general informational and educational purposes only. Nutrition values can vary based on onion size, preparation, and cooking methods. It should not replace advice from a qualified healthcare professional. Consult a healthcare professional for personalized dietary guidance.
