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Sliced Onion Calories
Source of vitamin C and fiber, low calorie, contains antioxidants
CALORIES
GI
POTASSIUM
FIBER
Sliced Onion Nutrition Facts
Selected: 100 g
40
KCAL / 100G
Carbs
9.3g
· 88%
Protein
1.1g
· 10%
Fat
0.1g
· 2%
Fiber
1.7g
Sliced Onion Vitamins & Minerals
Vitamins
Vitamin C
7.4mg · 8% DV
B6
0.12mg · 7% DV
Folate
19µg · 5% DV
B1
0.05mg · 4% DV
Minerals
Phosphorus
29mg · 4% DV
Potassium ⭐
146mg · 4% DV
Calcium
23mg · 2% DV
Magnesium
10mg · 2% DV
Sliced Onion Glycemic Index
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
Is Sliced 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 Sliced Onion Contain Allergens?
No known major allergens
Which Diets Is Sliced 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
Sliced 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 Sliced Onion
Sliced Onion — Frequently Asked Questions
How long does sliced onion keep in the fridge?
Stored in an airtight container or sealed bag, sliced onion usually keeps for up to 7 days in the refrigerator. Once cut, it loses moisture and odor control more quickly, so it should not be left uncovered.
Can sliced onion be frozen?
Yes, it freezes well for cooked dishes. After thawing it becomes softer, so it is better for soups, sautés, and stews than for salads.
How can I reduce eye irritation when cutting onion?
Chilling the onion briefly and using a sharp knife can help reduce the irritating compounds released into the air. Leaving the root end until last may also help a little.
Does cooking change onion’s nutrition a lot?
Cooking changes water content and flavor, and long cooking can reduce some heat-sensitive compounds. If oil is added, the total energy of the dish rises, but the onion’s natural carbohydrate and fiber do not simply disappear.
Is raw onion or cooked onion easier to digest?
For many people, cooked onion is easier to tolerate because heat softens some of its pungent compounds. Raw onion is more likely to bother people with reflux, a sensitive stomach, or IBS symptoms.
What foods pair well with sliced onion?
Sliced onion works well with eggs, legumes, meat dishes, sandwiches, and salads. Acidic ingredients such as lemon juice or vinegar can make its flavor taste milder and more balanced.
How do I make sliced onion less sharp or bitter?
Soaking the slices in cold water for 5 to 10 minutes can reduce harshness. A short marinade with lemon juice or vinegar can also mellow the flavor.
Is it okay to eat onion at night?
For most people, yes. But if you are prone to reflux, gas, or stomach irritation, raw onion in the evening may be more likely to cause discomfort.
Does onion work like a natural antibiotic?
No, onion is not a substitute for antibiotics and should not be relied on to treat an infection. It can be part of a healthy diet, but it is not a medical treatment.
Who should be careful with onion?
People with IBS, reflux, or a known sensitivity to raw onion may notice more symptoms after eating it. Individual tolerance matters, especially when onion is eaten raw or in larger amounts.
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Nutrition data compiled from USDA FoodData Central and scientific sources.