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Cooked onion Calories
Low calorie, source of fiber, contains antioxidants
CALORIES
GI
POTASSIUM
FIBER
Cooked onion Nutrition Facts
Selected: 100 g
44
KCAL / 100G
Carbs
10.1g
· 88%
Protein
1.1g
· 10%
Fat
0.1g
· 2%
Fiber
1.7g
Cooked onion Vitamins & Minerals
Vitamins
Vitamin C
7.4mg · 8% DV
B6
0.12mg · 7% DV
Folate
19µg · 5% DV
B1
0.04mg · 3% DV
Minerals
Phosphorus
29mg · 4% DV
Potassium ⭐
146mg · 4% DV
Calcium
23mg · 2% DV
Magnesium
10mg · 2% DV
Cooked onion Glycemic Index
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
Is Cooked onion Processed?
NOVA 2
Minimally Processed
1. Unprocessed
2. Minimally Processed
3. Processed
4. Ultra-Processed
NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.
Does Cooked onion Contain Allergens?
No known major allergens
Which Diets Is Cooked onion Good For?
Vegan
✓ Suitable
Vegetarian
✓ Suitable
Gluten-Free
✓ Suitable
Dairy-Free
— Not suitable
Mediterranean
✓ Suitable
Paleo
✓ Suitable
Whole30
— Not suitable
DASH
— Not suitable
Keto
— Not suitable
Low FODMAP
— Not suitable
Cooked onion Fat Profile
SATURATED
0.03g
MONOUNSATURATED
0.01g
POLYUNSATURATED
0.03g
Omega 6:3 ratio 2:1
Below the ideal 4:1 — a good omega balance.
Foods Similar to Cooked onion
Cooked onion — Frequently Asked Questions
Why do cooked onions taste sweeter than raw onions?
Cooking softens the onion’s structure and makes its natural sugars more noticeable. Slow cooking over low heat intensifies that sweetness further.
What is the best way to caramelize onions without burning them?
Slice them evenly and cook over low to medium heat with a little oil, stirring regularly. High heat tends to scorch onions and can make them taste bitter rather than caramelized.
Can cooked onions cause gas?
Yes, especially in sensitive people, because onions contain fermentable carbohydrates that may cause bloating and gas. Cooking often makes them easier to tolerate than raw onions, but does not remove this effect completely.
Can people with sensitive digestion eat cooked onions?
Cooked onions can still trigger symptoms in people with irritable bowel syndrome or those following a low-FODMAP approach. Try a small amount first, or use onion-infused oil for flavor without the same fermentable compounds.
How long do cooked onions keep in the refrigerator?
Cool them within two hours of cooking and store them in a sealed container. They are generally best used within 3 to 4 days; discard them if they smell sour, feel slimy, or show mold.
Can cooked onions be frozen?
Yes. Let them cool fully, freeze in meal-sized portions, and use them later in soups, sauces, omelets, or cooked dishes. Their texture will become softer after thawing.
Are cooked onions a good source of protein?
No, cooked onions are not a substantial protein food. Pair them with eggs, yogurt, beans, fish, chicken, or tofu to make a more balanced meal.
Why do cooked onions work well with meat dishes?
Their mild sweetness balances rich, savory meat flavors and adds moisture to the dish. They also make it easy to include a vegetable component alongside meat, especially when combined with beans or a salad.
Can eating cooked onions at night upset the stomach?
Many people tolerate them well, but onions can trigger heartburn or reflux symptoms in susceptible individuals. If this happens to you, keep the evening portion small and avoid eating them right before lying down.
Can cooked onions replace antibiotics?
No. Onions contain plant compounds, but they do not treat bacterial infections and should never replace prescribed antibiotic treatment.
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Nutrition data compiled from USDA FoodData Central and scientific sources.