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Grapefruit vs. Fennel — In-Depth Nutrition Comparison

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How are grapefruit and fennel different?

  • Grapefruit is higher in vitamin C; however, fennel is richer in vitamin K, potassium, iron, manganese, and fiber.
  • Daily need coverage for vitamin K for fennel is 52% higher.
  • Grapefruit contains 3 times more vitamin C than fennel. While grapefruit contains 31.2mg of vitamin C, fennel contains only 12mg.
  • Fennel has less sugar.
  • Grapefruit has a lower glycemic index (25) than fennel (45).

Grapefruit, raw, pink and red, all areas and Fennel, bulb, raw are the varieties used in this article.

Infographic

Grapefruit vs Fennel infographic
Infographic link

Mineral Comparison

Mineral comparison score is based on the number of minerals by which one or the other food is richer. The "coverage" charts below show how much of the daily needs can be covered by 300 grams of the food.
Magnesium Magnesium Calcium Calcium Potassium Potassium Iron Iron Copper Copper Zinc Zinc Phosphorus Phosphorus Sodium Sodium Manganese Manganese Selenium Selenium 6.4% 6.6% 12% 3% 11% 1.9% 7.7% 0% 2.9% 0.55%
Fennel
9
Magnesium Magnesium Calcium Calcium Potassium Potassium Iron Iron Copper Copper Zinc Zinc Phosphorus Phosphorus Sodium Sodium Manganese Manganese Selenium Selenium 12% 15% 37% 27% 22% 5.5% 21% 6.8% 25% 3.8%
Contains less SodiumSodium -100%
Contains more MagnesiumMagnesium +88.9%
Contains more CalciumCalcium +122.7%
Contains more PotassiumPotassium +206.7%
Contains more IronIron +812.5%
Contains more CopperCopper +106.3%
Contains more ZincZinc +185.7%
Contains more PhosphorusPhosphorus +177.8%
Contains more ManganeseManganese +768.2%
Contains more SeleniumSelenium +600%

Vitamin Comparison

Vitamin comparison score is based on the number of vitamins by which one or the other food is richer. The "coverage" charts below show how much of the daily needs can be covered by 300 grams of the food.
Vitamin C Vit. C Vitamin A Vit. A Vitamin E Vit. E Vitamin D Vit. D Vitamin B1 Vit. B1 Vitamin B2 Vit. B2 Vitamin B3 Vit. B3 Vitamin B5 Vit. B5 Vitamin B6 Vit. B6 Vitamin B12 Vit. B12 Vitamin K Vit. K Folate Folate Choline Choline 104% 19% 2.6% 0% 11% 7.2% 3.8% 16% 12% 0% 0% 9.8% 4.2%
Fennel
5
Vitamin C Vit. C Vitamin A Vit. A Vitamin E Vit. E Vitamin D Vit. D Vitamin B1 Vit. B1 Vitamin B2 Vit. B2 Vitamin B3 Vit. B3 Vitamin B5 Vit. B5 Vitamin B6 Vit. B6 Vitamin B12 Vit. B12 Vitamin K Vit. K Folate Folate Choline Choline 40% 16% 12% 0% 2.5% 7.4% 12% 14% 11% 0% 157% 20% 7.2%
Contains more Vitamin CVitamin C +160%
Contains more Vitamin AVitamin A +20.8%
Contains more Vitamin B1Vitamin B1 +330%
Contains more Vitamin B5Vitamin B5 +12.9%
Contains more Vitamin B6Vitamin B6 +12.8%
Contains more Vitamin EVitamin E +346.2%
Contains more Vitamin B3Vitamin B3 +213.7%
Contains more Vitamin KVitamin K +∞%
Contains more FolateFolate +107.7%
Contains more CholineCholine +71.4%
~equal in Vitamin D ~0µg
~equal in Vitamin B2 ~0.032mg
~equal in Vitamin B12 ~0µg

Macronutrient Comparison

Macronutrient breakdown side-by-side comparison
11% 88%
Protein: 0.77 g
Fats: 0.14 g
Carbs: 10.66 g
Water: 88.06 g
Other: 0.37 g
Fennel
4
7% 90%
Protein: 1.24 g
Fats: 0.2 g
Carbs: 7.3 g
Water: 90.21 g
Other: 1.05 g
Contains more CarbsCarbs +46%
Contains more ProteinProtein +61%
Contains more FatsFats +42.9%
Contains more OtherOther +183.8%
~equal in Water ~90.21g

Fat Type Comparison

Fat type breakdown side-by-side comparison
27% 26% 47%
Saturated fat: Sat. Fat 0.021 g
Monounsaturated fat: Mono. Fat 0.02 g
Polyunsaturated fat: Poly. Fat 0.036 g
Fennel
2
28% 21% 52%
Saturated fat: Sat. Fat 0.09 g
Monounsaturated fat: Mono. Fat 0.068 g
Polyunsaturated fat: Poly. Fat 0.169 g
Contains less Sat. FatSaturated fat -76.7%
Contains more Mono. FatMonounsaturated fat +240%
Contains more Poly. FatPolyunsaturated fat +369.4%

Comparison summary table

Pay attention to the rightmost column. It displays the amounts side by side, giving a clearer understanding of the difference.
Grapefruit Fennel
Lower in Sodium ok
Lower in Saturated fat ok
Lower in Glycemic Index ok
Lower in Sugar ok
Lower in price ok
Rich in minerals ok
Lower in Cholesterol Equal
Rich in vitamins Equal

All nutrients comparison - raw data values

Nutrient Grapefruit Fennel DV% diff.
Vitamin K 0µg 62.8µg 52%
Vitamin C 31.2mg 12mg 21%
Potassium 135mg 414mg 8%
Iron 0.08mg 0.73mg 8%
Manganese 0.022mg 0.191mg 7%
Fiber 1.6g 3.1g 6%
Phosphorus 18mg 50mg 5%
Folate 13µg 27µg 4%
Copper 0.032mg 0.066mg 4%
Vitamin B1 0.043mg 0.01mg 3%
Vitamin B3 0.204mg 0.64mg 3%
Calcium 22mg 49mg 3%
Vitamin E 0.13mg 0.58mg 3%
Sodium 0mg 52mg 2%
Fructose 1.77g 2%
Magnesium 9mg 17mg 2%
Zinc 0.07mg 0.2mg 1%
Vitamin B5 0.262mg 0.232mg 1%
Polyunsaturated fat 0.036g 0.169g 1%
Vitamin A 58µg 48µg 1%
Choline 7.7mg 13.2mg 1%
Calories 42kcal 31kcal 1%
Carbs 10.66g 7.3g 1%
Protein 0.77g 1.24g 1%
Selenium 0.1µg 0.7µg 1%
Fats 0.14g 0.2g 0%
Net carbs 9.06g 4.2g N/A
Sugar 6.89g 3.93g N/A
Vitamin B2 0.031mg 0.032mg 0%
Vitamin B6 0.053mg 0.047mg 0%
Saturated fat 0.021g 0.09g 0%
Monounsaturated fat 0.02g 0.068g 0%
Tryptophan 0.008mg 0%
Threonine 0.013mg 0%
Isoleucine 0.008mg 0%
Leucine 0.015mg 0%
Lysine 0.019mg 0%
Methionine 0.007mg 0%
Phenylalanine 0.013mg 0%
Valine 0.015mg 0%
Histidine 0.008mg 0%

Which food is preferable for your diet?

ok
ok
is better in case of low diet
Grapefruit Fennel
Low Calories diet ok
Low Fats diet ok
Low Carbs diet ok
Low Glycemic Index diet ok

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Vitamins & Minerals Daily Need Coverage Score

The summary scores indicate the extent to which this food can fulfill your daily vitamin and mineral requirements if you consume 3 servings, consisting of 100 grams of each (an approximation of 3 serving sizes).
Vitamins Daily Need Coverage Score
15%
Grapefruit
23%
Fennel
Minerals Daily Need Coverage Score
5%
Grapefruit
18%
Fennel

Comparison summary

Which food contains less Sodium?
Grapefruit
Grapefruit contains less Sodium (difference - 52mg)
Which food is lower in Saturated fat?
Grapefruit
Grapefruit is lower in Saturated fat (difference - 0.069g)
Which food is lower in glycemic index?
Grapefruit
Grapefruit is lower in glycemic index (difference - 20)
Which food is lower in Sugar?
Fennel
Fennel is lower in Sugar (difference - 2.96g)
Which food is cheaper?
Fennel
Fennel is cheaper (difference - $0.1)
Which food is richer in minerals?
Fennel
Fennel is relatively richer in minerals
Which food contains less Cholesterol?
?
The foods are relatively equal in Cholesterol (0 mg)
Which food is richer in vitamins?
?
It cannot be stated which food is richer in vitamins. See the charts below for detailed information. See the charts below for detailed information. See the charts below for detailed information.

References

All the values for which the sources are not specified explicitly are taken from FDA’s Food Central. The exact link to the food presented on this page can be found below.

  1. Grapefruit - https://fdc.nal.usda.gov/fdc-app.html#/food-details/174673/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.