Foods / Spices and condiments

Onion (Pyaz): Nutrition and who it suits

Onion is a good choice for weight loss, PCOS and diabetes, and fine in a portion for menopause. 100 g has 48 kcal, 1.5 g of protein and 2.5 g of fibre. One serving is one medium onion (100 g), about 48 kcal.

View of a whole and sliced onion

Numbers worked out by Poshan Labs from IFCT 2017 (ICMR-NIN), using the rules on How the ratings work. Last updated 26 October 2026.

Nutrition per 100 g

NutrientPer 100 g
Energy48 kcal
Protein1.5 g
Carbohydrate9.6 g
Fibre2.5 g
Sugars5.9 g
Fat0.2 g
Folate28.9 µg
Vitamin C6.7 mg
Potassium171 mg

Where its calories come from

82%
  • Protein 13%
  • Carbohydrate 82%
  • Fat 5%

Worked out from the protein, carbohydrate and fat above, at 4, 4 and 9 kcal a gram.

How many calories in one serving of onion?

About 48 kcal for one medium onion (100 g), and about 96 kcal if you have two.

One serving, against your day

How much of an adult woman's daily need one serving (100 g) fills.

13%Folate
28.9 µg
10%Vitamin C
6.7 mg
5%Potassium
171 mg
5%Magnesium
18 mg
3%Protein
1.5 g
3%Zinc
0.3 mg

Source

Source: Indian Food Composition Tables 2017, National Institute of Nutrition (ICMR), food code G017. Daily need is from ICMR-NIN Nutrient Requirements for Indians 2020, adult woman, moderate activity.

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Is onion good for weight loss, PCOS, diabetes and menopause?

Weight loss

Good choice

Only 48 kcal per 100 g, so you can eat a full portion.

PCOS and PCOD

Good choice

Only 9.6 g of carbohydrate in a 100 g serving.

Diabetes

Good choice

Only 9.6 g of carbohydrate in a 100 g serving.

Menopause

Fine as part of a meal

Not a standout for calcium or protein in a 100 g serving, but fine as part of a meal.

Weight lossGood choiceOnly 48 kcal per 100 g, so you can eat a full portion.
PCOS and diabetesGood choiceOnly 9.6 g of carbohydrate in a 100 g serving.
MenopauseFine as part of a mealNot a standout for calcium or protein in a 100 g serving, but fine as part of a meal.

These ratings come from the numbers alone. On a free call, Puja looks at what fits your reports. How the ratings work.

How to eat it

Dishes on this site that use onion, each with its calories per portion:

Varieties

Per 100 g.

VarietykcalProtein (g)Carbs (g)Fibre (g)
Big (shown above)481.59.62.5
Small571.811.61.2

Also called

Assamese: Piyanj; Bengali: Peyaj; Gujarati: Kando; Hindi: Pyaz; Kannada: Eerulli; Kashmiri: Gandha; Malayalam: Ulli; Marathi: Kanda; Odia: Piaja; Punjabi: Gandhe; Sanskrit: Palaanduh; Tamil: Vengayam; Telugu: Neerulli/Ullipaya; Urdu: Pyaaz.

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