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Onion (sliced) Calories
Low calorie, source of fiber, contains vitamin C
CALORIES
GI
POTASSIUM
FIBER
Onion (sliced) Nutrition Facts
Selected: 100 g
40
KCAL / 100G
Carbs
9.3g
· 88%
Protein
1.1g
· 10%
Fat
0.1g
· 2%
Fiber
1.7g
Onion (sliced) 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
Onion (sliced) Glycemic Index
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
Is Onion (sliced) 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 Onion (sliced) Contain Allergens?
No known major allergens
Which Diets Is Onion (sliced) Good For?
Vegan
✓ Suitable
Vegetarian
✓ Suitable
Gluten-Free
✓ Suitable
Dairy-Free
— Not suitable
Mediterranean
✓ Suitable
Paleo
✓ Suitable
Whole30
— Not suitable
DASH
— Not suitable
Keto
✓ Suitable
Low FODMAP
— Not suitable
Onion (sliced) Fat Profile
SATURATED
0.03g
MONOUNSATURATED
0.01g
POLYUNSATURATED
0.02g
Omega 6:3 ratio 2:1
Below the ideal 4:1 — a good omega balance.
Foods Similar to Onion (sliced)
Onion (sliced) — 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. Discard it if it becomes slimy, very soft, or develops an off smell.
Can sliced onion be frozen?
Yes. After thawing, the texture becomes softer, so it works best in soups, stews, and sautés rather than fresh salads or sandwiches.
How can I reduce tearing when cutting onions?
Chilling the onion briefly, using a sharp knife, and cutting the root end last can help. Less cell damage means fewer irritating compounds released into the air.
Does cooking onion ruin its nutrition?
Not at all. Cooking changes texture and water content, and prolonged high heat can reduce some delicate compounds, but onion still contributes flavor and useful nutrients after cooking.
Is raw onion or cooked onion easier to digest?
Cooked onion is often easier for many people because heat softens its structure and mellows pungent compounds. Raw onion can trigger bloating, reflux, or stomach discomfort in sensitive individuals.
Why does onion cause gas or bloating for some people?
Onion contains naturally occurring carbohydrates that can ferment in the gut. People with IBS or sensitive digestion may tolerate smaller portions or cooked onion better than raw.
What foods pair well with sliced onion?
It goes well with eggs, meats, legumes, salads, yogurt-based dishes, and grain bowls. It adds sharpness and depth, which can make simple high-protein or high-fiber meals more satisfying.
Is onion a good choice before a workout?
It depends on your tolerance. Raw onion can cause burping or stomach discomfort for some people, so a milder pre-workout meal may be a better option.
Is it safe to leave sliced onion at room temperature?
Only briefly during meal prep. Once cut, onion should be refrigerated to help maintain freshness and food safety.
Can onion replace antibiotics or cold medicine?
No. Onion is a nutritious vegetable, but it does not replace medical treatment for infections or illness; it can only be part of an overall healthy diet.
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Nutrition data compiled from USDA FoodData Central and scientific sources.