CEBOLLA

Most onion cultivars are about 89% water, 9% carbohydrates (including 4% sugar and 2% dietary fibre), 1% protein, and negligible fat (table). Onions contain low amounts of essential nutrients and have an energy value of 166 kJ (40 Calories) in a 100 g (3.5 oz) amount. Onions contribute savoury flavour to dishes without contributing significant caloric content.^[20]

Nutritional value per 100 g (3.5 oz)
Energy	166 kJ (40 kcal)
Carbohydrates	9.34 g
Sugars	4.24 g
Dietary fibre	1.7 g
Fat	0.1 g
Protein	1.1 g
Vitamins	Quantity %DV†
Thiamine (B1)	4% 0.046 mg
Riboflavin (B2)	2% 0.027 mg
Niacin (B3)	1% 0.116 mg
Pantothenic acid (B5)	2% 0.123 mg
Vitamin B6	9% 0.12 mg
Folate (B9)	5% 19 μg
Vitamin C	9% 7.4 mg
Minerals	Quantity %DV†
Calcium	2% 23 mg
Iron	2% 0.21 mg
Magnesium	3% 10 mg
Manganese	6% 0.129 mg
Phosphorus	4% 29 mg
Potassium	3% 146 mg
Zinc	2% 0.17 mg
Other constituents	Quantity
Water	89.11 g
Fluoride	1.1 µg
Link to USDA Database entry