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Onion vs Fennel - In-Depth Nutrition Comparison

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How are Onion and Fennel different?

  • Onion is higher in Vitamin B6, however Fennel is richer in Vitamin K, Potassium, Iron, Fiber, Vitamin A, and Vitamin C.
  • Daily need coverage for Vitamin K from Fennel is 52% higher.
  • Onion contains 3 times more Vitamin B6 than Fennel. While Onion contains 0.12mg of Vitamin B6, Fennel contains only 0.047mg.

Onions, raw and Fennel, bulb, raw are the varieties used in this article.

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Onion vs Fennel infographic
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Mineral Comparison

Mineral comparison score is based on the number of minerals by which one or the other food is richer. The "coverage" chart below show how much of the daily needs can be covered by 300 grams of the food
Onion
1
:
7
Fennel
Contains less Sodium -92.3%
Contains more Iron +247.6%
Contains more Calcium +113%
Contains more Potassium +183.6%
Contains more Magnesium +70%
Contains more Copper +69.2%
Contains more Zinc +17.6%
Contains more Phosphorus +72.4%
Iron Calcium Potassium Magnesium Copper Zinc Phosphorus Sodium 8% 7% 13% 8% 14% 5% 13% 1%
Iron Calcium Potassium Magnesium Copper Zinc Phosphorus Sodium 28% 15% 37% 13% 22% 6% 22% 7%
Contains less Sodium -92.3%
Contains more Iron +247.6%
Contains more Calcium +113%
Contains more Potassium +183.6%
Contains more Magnesium +70%
Contains more Copper +69.2%
Contains more Zinc +17.6%
Contains more Phosphorus +72.4%

Vitamin Comparison

Vitamin comparison score is based on the number of vitamins by which one or the other food is richer. The "coverage" chart below show how much of the daily needs can be covered by 300 grams of the food
Onion
2
:
8
Fennel
Contains more Vitamin B1 +360%
Contains more Vitamin B6 +155.3%
Contains more Vitamin C +62.2%
Contains more Vitamin A +48050%
Contains more Vitamin E +2800%
Contains more Vitamin B2 +18.5%
Contains more Vitamin B3 +451.7%
Contains more Vitamin B5 +88.6%
Contains more Vitamin K +15600%
Contains more Folate +42.1%
Vitamin C Vitamin A Vitamin E Vitamin D Vitamin B1 Vitamin B2 Vitamin B3 Vitamin B5 Vitamin B6 Vitamin B12 Vitamin K Folate 25% 1% 1% 0% 12% 7% 3% 8% 28% 0% 1% 15%
Vitamin C Vitamin A Vitamin E Vitamin D Vitamin B1 Vitamin B2 Vitamin B3 Vitamin B5 Vitamin B6 Vitamin B12 Vitamin K Folate 40% 58% 12% 0% 3% 8% 12% 14% 11% 0% 157% 21%
Contains more Vitamin B1 +360%
Contains more Vitamin B6 +155.3%
Contains more Vitamin C +62.2%
Contains more Vitamin A +48050%
Contains more Vitamin E +2800%
Contains more Vitamin B2 +18.5%
Contains more Vitamin B3 +451.7%
Contains more Vitamin B5 +88.6%
Contains more Vitamin K +15600%
Contains more Folate +42.1%

Vitamin and Mineral Summary Scores

The summary score is calculated by summing up the daily values contained in 300 grams of the product. Obviously the more the food fulfills human daily needs, the more the summary score is.
Vitamin Summary Score
8
Onion
28
Fennel
Mineral Summary Score
8
Onion
18
Fennel

Macronutrients Comparison

Macronutrient comparison charts compare the amount of protein, total fats, and total carbohydrates in 300 grams of the food. The displayed values show how much of the daily needs can be covered by 300 grams of food.
Protein
7%
Onion
7%
Fennel
Carbohydrates
9%
Onion
7%
Fennel
Fats
0%
Onion
1%
Fennel

Comparison summary table

Pay attention to the most right column. It shows the amounts side by side, making it easier to realize the amount of difference.
Onion Fennel
Lower in Sodium ok
Lower in Saturated Fat ok
Lower in glycemic index ok
Lower in Sugar ok
Rich in minerals ok
Rich in vitamins ok
Lower in Cholesterol Equal
Lower in price Equal

Which food is preferable for your diet?

ok
ok
is better in case of low diet
Onion Fennel
Low Calories diet ok
Low Fats diet ok
Low Carbs diet ok
Low glycemic index diet ok

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Comparison summary

Which food contains less Sodium?
Onion
Onion contains less Sodium (difference - 48mg)
Which food is lower in Saturated Fat?
Onion
Onion is lower in Saturated Fat (difference - 0.048g)
Which food is lower in glycemic index?
Onion
Onion is lower in glycemic index (difference - 30)
Which food is lower in Sugar?
Fennel
Fennel is lower in Sugar (difference - 0.31g)
Which food is richer in minerals?
Fennel
Fennel is relatively richer in minerals
Which food is richer in vitamins?
Fennel
Fennel is relatively richer in vitamins
Which food contains less Cholesterol?
?
The foods are relatively equal in Cholesterol (0 mg)
Which food is cheaper?
?
The foods are relatively equal in price ($0.2)

All nutrients comparison - raw data values

Nutrient Onion Fennel Opinion
Calories 40 31 Onion
Protein 1.1 1.24 Fennel
Fats 0.1 0.2 Fennel
Vitamin C 7.4 12 Fennel
Net carbs 7.639999866485596 4.199999809265137 Onion
Carbs 9.34 7.3 Onion
Cholesterol 0 0
Vitamin D 0 0
Iron 0.21 0.73 Fennel
Calcium 23 49 Fennel
Potassium 146 414 Fennel
Magnesium 10 17 Fennel
Sugar 4.24 3.93 Fennel
Fiber 1.7 3.1 Fennel
Copper 0.039 0.066 Fennel
Zinc 0.17 0.2 Fennel
Starch 0 Onion
Phosphorus 29 50 Fennel
Sodium 4 52 Onion
Vitamin A 2 963 Fennel
Vitamin E 0.02 0.58 Fennel
Vitamin D 0 0
Vitamin B1 0.046 0.01 Onion
Vitamin B2 0.027 0.032 Fennel
Vitamin B3 0.116 0.64 Fennel
Vitamin B5 0.123 0.232 Fennel
Vitamin B6 0.12 0.047 Onion
Vitamin B12 0 0
Vitamin K 0.4 62.8 Fennel
Folate 19 27 Fennel
Trans Fat 0 0
Saturated Fat 0.042 0.09 Onion
Monounsaturated Fat 0.013 0.068 Fennel
Polyunsaturated fat 0.017 0.169 Fennel
Tryptophan 0.014 Onion
Threonine 0.021 Onion
Isoleucine 0.014 Onion
Leucine 0.025 Onion
Lysine 0.039 Onion
Methionine 0.002 Onion
Phenylalanine 0.025 Onion
Valine 0.021 Onion
Histidine 0.014 Onion
Fructose 1.29 Onion

References

The source of all the nutrient values on the page (excluding the main article the sources for which are presented separately if present) is the USDA's FoodCentral. The exact links to the foods presented on this page can be found below.

  1. Onion - https://fdc.nal.usda.gov/fdc-app.html#/food-details/170000/nutrients
  2. Fennel - https://fdc.nal.usda.gov/fdc-app.html#/food-details/169385/nutrients

All the Daily Values are presented for males aged 31-50, for 2000 calorie diets.

Data provided by FoodStruct.com should be considered and used as information only. Please consult your physician before beginning any diet.