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Onion (large, half) Calories
Low calorie, source of vitamin C, contains fiber
CALORIES
GI
POTASSIUM
FIBER
Onion (large, half) Nutrition Facts
Selected: 100 g
40
KCAL / 100G
Carbs
9.3g
· 88%
Protein
1.1g
· 10%
Fat
0.1g
· 2%
Fiber
1.7g
Onion (large, half) 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
Onion (large, half) Glycemic Index
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
Is Onion (large, half) Processed?
NOVA 1
Unprocessed
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 (large, half) Contain Allergens?
No known major allergens
Which Diets Is Onion (large, half) 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
Onion (large, half) 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 (large, half)
Onion (large, half) — Frequently Asked Questions
How long does half a large onion keep after cutting?
A cut onion usually keeps for about 2–3 days in the fridge if wrapped well or stored in an airtight container. Discard it if it becomes slimy, very soft, or develops an off smell.
Can half a large onion be frozen?
Yes, onion can be frozen chopped or sliced, especially for soups, stews, and sautés. After thawing, the texture becomes softer, so it is less suitable for raw use.
How can I reduce eye irritation when cutting onion?
Chilling the onion first, using a sharp knife, and cutting the root end last can help reduce the irritating compounds released into the air. Good ventilation also helps.
Does cooking onion ruin its nutritional value?
Cooking changes onion’s flavor and can reduce some heat-sensitive compounds, but it does not make it nutritionally useless. Gentle cooking often preserves more character than prolonged high heat.
What is the difference between raw onion and caramelized onion?
Raw onion tastes sharper and more pungent, while caramelized onion becomes sweeter and softer. They are not interchangeable in every dish because the flavor impact is very different.
What foods pair well with onion?
Onion works well with eggs, legumes, meat, poultry, fish, salads, and yogurt-based dishes. It is often used as a flavor base because it adds depth without needing heavy sauces.
Is onion a good food before a workout?
It depends on your digestion; raw onion can cause discomfort, bloating, or burping in some people before exercise. If you want to include it, cooked onion is often easier to tolerate.
Is it bad to eat onion at night?
For most people, no. But if you are prone to reflux, indigestion, or a sensitive stomach, raw onion in the evening may be more likely to cause symptoms.
Does onion always cause gas and bloating?
No, but it can in sensitive people because it contains fermentable carbohydrates that some guts handle poorly. People with IBS or similar digestive issues may need to watch portion and preparation.
Is it true that onion can kill germs on its own?
No, onion contains useful plant compounds, but it is not a substitute for medical treatment or food safety practices. It can be part of a healthy diet without being a cure-all.
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Nutrition data compiled from USDA FoodData Central and scientific sources.