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Onion vs. Zucchini — In-Depth Nutrition Comparison

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How are Onion and Zucchini different?

  • Zucchini has more Vitamin C, and Vitamin B2 than Onion.
  • Daily need coverage for Vitamin C from Zucchini is 12% higher.
  • Onion contains 2 times more Fiber than Zucchini. While Onion contains 1.7g of Fiber, Zucchini contains only 1g.
  • Zucchini has less Sugar.

Onions, raw and Squash, summer, zucchini, includes skin, raw are the varieties used in this article.

Infographic

Onion vs Zucchini 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" charts below show how much of the daily needs can be covered by 300 grams of the food.
Onion
3
Magnesium Magnesium Calcium Calcium Potassium Potassium Iron Iron Copper Copper Zinc Zinc Phosphorus Phosphorus Sodium Sodium Manganese Manganese Selenium Selenium 7.1% 6.9% 13% 7.9% 13% 4.6% 12% 0.52% 17% 2.7%
Magnesium Magnesium Calcium Calcium Potassium Potassium Iron Iron Copper Copper Zinc Zinc Phosphorus Phosphorus Sodium Sodium Manganese Manganese Selenium Selenium 13% 4.8% 23% 14% 18% 8.7% 16% 1% 23% 1.1%
Contains more CalciumCalcium +43.8%
Contains less SodiumSodium -50%
Contains more SeleniumSelenium +150%
Contains more MagnesiumMagnesium +80%
Contains more PotassiumPotassium +78.8%
Contains more IronIron +76.2%
Contains more CopperCopper +35.9%
Contains more ZincZinc +88.2%
Contains more PhosphorusPhosphorus +31%
Contains more ManganeseManganese +37.2%

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.
Onion
0
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 25% 0.12% 0.4% 0% 12% 6.2% 2.2% 7.4% 28% 0% 1% 14% 3.3%
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 60% 12% 2.4% 0% 11% 22% 8.5% 12% 38% 0% 11% 18% 5.2%
Contains more Vitamin CVitamin C +141.9%
Contains more Vitamin AVitamin A +9900%
Contains more Vitamin EVitamin E +500%
Contains more Vitamin B2Vitamin B2 +248.1%
Contains more Vitamin B3Vitamin B3 +288.8%
Contains more Vitamin B5Vitamin B5 +65.9%
Contains more Vitamin B6Vitamin B6 +35.8%
Contains more Vitamin KVitamin K +975%
Contains more FolateFolate +26.3%
Contains more CholineCholine +55.7%
~equal in Vitamin D ~0µg
~equal in Vitamin B1 ~0.045mg
~equal in Vitamin B12 ~0µg

Macronutrient Comparison

Macronutrient breakdown side-by-side comparison
Onion
1
9% 89%
Protein: 1.1 g
Fats: 0.1 g
Carbs: 9.34 g
Water: 89.11 g
Other: 0.35 g
3% 95%
Protein: 1.21 g
Fats: 0.32 g
Carbs: 3.11 g
Water: 94.79 g
Other: 0.57 g
Contains more CarbsCarbs +200.3%
Contains more FatsFats +220%
Contains more OtherOther +62.9%
~equal in Protein ~1.21g
~equal in Water ~94.79g

Fat Type Comparison

Fat type breakdown side-by-side comparison
Onion
2
58% 18% 24%
Saturated Fat: Sat. Fat 0.042 g
Monounsaturated Fat: Mono. Fat 0.013 g
Polyunsaturated fat: Poly. Fat 0.017 g
45% 6% 49%
Saturated Fat: Sat. Fat 0.084 g
Monounsaturated Fat: Mono. Fat 0.011 g
Polyunsaturated fat: Poly. Fat 0.091 g
Contains less Sat. FatSaturated Fat -50%
Contains more Mono. FatMonounsaturated Fat +18.2%
Contains more Poly. FatPolyunsaturated fat +435.3%

Carbohydrate type comparison

Carbohydrate type breakdown side-by-side comparison
Onion
2
23% 46% 30%
Starch: 0 g
Sucrose: 0.99 g
Glucose: 1.97 g
Fructose: 1.29 g
Lactose: 0 g
Maltose: 0 g
Galactose: 0 g
2% 43% 55%
Starch: 0 g
Sucrose: 0.05 g
Glucose: 1.07 g
Fructose: 1.38 g
Lactose: 0 g
Maltose: 0 g
Galactose: 0 g
Contains more SucroseSucrose +1880%
Contains more GlucoseGlucose +84.1%
~equal in Starch ~0g
~equal in Fructose ~1.38g
~equal in Lactose ~0g
~equal in Maltose ~0g
~equal in Galactose ~0g

Comparison summary table

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

All nutrients comparison - raw data values

Nutrient Onion Zucchini Opinion
Calories 40kcal 17kcal Onion
Protein 1.1g 1.21g Zucchini
Fats 0.1g 0.32g Zucchini
Vitamin C 7.4mg 17.9mg Zucchini
Net carbs 7.64g 2.11g Onion
Carbs 9.34g 3.11g Onion
Magnesium 10mg 18mg Zucchini
Calcium 23mg 16mg Onion
Potassium 146mg 261mg Zucchini
Iron 0.21mg 0.37mg Zucchini
Sugar 4.24g 2.5g Zucchini
Fiber 1.7g 1g Onion
Copper 0.039mg 0.053mg Zucchini
Zinc 0.17mg 0.32mg Zucchini
Phosphorus 29mg 38mg Zucchini
Sodium 4mg 8mg Onion
Vitamin A 2IU 200IU Zucchini
Vitamin A 0µg 10µg Zucchini
Vitamin E 0.02mg 0.12mg Zucchini
Manganese 0.129mg 0.177mg Zucchini
Selenium 0.5µg 0.2µg Onion
Vitamin B1 0.046mg 0.045mg Onion
Vitamin B2 0.027mg 0.094mg Zucchini
Vitamin B3 0.116mg 0.451mg Zucchini
Vitamin B5 0.123mg 0.204mg Zucchini
Vitamin B6 0.12mg 0.163mg Zucchini
Vitamin K 0.4µg 4.3µg Zucchini
Folate 19µg 24µg Zucchini
Choline 6.1mg 9.5mg Zucchini
Saturated Fat 0.042g 0.084g Onion
Monounsaturated Fat 0.013g 0.011g Onion
Polyunsaturated fat 0.017g 0.091g Zucchini
Tryptophan 0.014mg 0.01mg Onion
Threonine 0.021mg 0.029mg Zucchini
Isoleucine 0.014mg 0.044mg Zucchini
Leucine 0.025mg 0.071mg Zucchini
Lysine 0.039mg 0.067mg Zucchini
Methionine 0.002mg 0.018mg Zucchini
Phenylalanine 0.025mg 0.043mg Zucchini
Valine 0.021mg 0.054mg Zucchini
Histidine 0.014mg 0.026mg Zucchini
Fructose 1.29g 1.38g Zucchini
Omega-3 - ALA 0.061g Zucchini
Omega-6 - Linoleic acid 0.03g Zucchini

Which food is preferable for your diet?

ok
ok
is better in case of low diet
Onion Zucchini
Low Calories diet ok
Low Fats diet ok
Low Carbs diet ok
Low Glycemic Index diet Equal

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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
8%
Onion
15%
Zucchini
Minerals Daily Need Coverage Score
8%
Onion
12%
Zucchini

Comparison summary

Which food is richer in minerals?
Zucchini
Zucchini is relatively richer in minerals
Which food is lower in Sugar?
Zucchini
Zucchini is lower in Sugar (difference - 1.74g)
Which food is richer in vitamins?
Zucchini
Zucchini is relatively richer in vitamins
Which food contains less Sodium?
Onion
Onion contains less Sodium (difference - 4mg)
Which food is lower in Saturated Fat?
Onion
Onion is lower in Saturated Fat (difference - 0.042g)
Which food is cheaper?
Onion
Onion is cheaper (difference - $0.2)
Which food contains less Cholesterol?
?
The foods are relatively equal in Cholesterol (0 mg)
Which food is lower in glycemic index?
?
The foods have equal glycemic indexes (15)

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. Onion - https://fdc.nal.usda.gov/fdc-app.html#/food-details/170000/nutrients
  2. Zucchini - https://fdc.nal.usda.gov/fdc-app.html#/food-details/169291/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.