Yellow Onion (Raw Allium Bulb)
Vegetables & Leafy Greens · 12 specs
Direct Answer
Per 100g raw yellow onion, it provides 40 kcal, 1.10g protein, 9.34g carbohydrates (1.7g fiber / 4.24g sugars / 7.64g net carbs), 0.10g fat, 146mg potassium, 7.4mg Vitamin C, and 300mg/kg quercetin flavonoids with a Glycemic Index of 15.
Source: USDA FoodData Central (NDB# 11282) · Last reviewed Aug 28, 2026
Specs
| Energy / Calories | 40 kcal (167 kJ) kcal |
| Protein | 1.10 g g |
| Carbohydrates | 9.34 g (Net Carbs: 7.64 g) g |
| Dietary Fiber | 1.70 g (Rich in prebiotic fructooligosaccharides / FOS) g |
| Net Carbohydrates | 7.64 g g |
| Total Sugars | 4.24 g (1.97g glucose, 1.29g fructose, 0.98g sucrose) g |
| Total Fat | 0.10 g g |
| Vitamin C | 7.4 mg (8% DV) mg |
| Folate (B9) | 19 µg µg |
| Potassium | 146 mg mg |
| Quercetin Flavonoids | ~280 – 350 mg / kg (Concentrated in outer flesh) mg/kg |
| Water Content | 89.1 % % |
Lachrymatory Factor & Caramelization
Cutting onions mixes lachrymatory factor synthase with sulfenic acids, creating syn-propanethial-S-oxide gas that stimulates corneal nerves to trigger tearing. Long, slow cooking breaks down sulfur compounds while concentrating natural sugars into rich caramelized fond.
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