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Onion vs. Tomato — In-Depth Nutrition Comparison

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Differences between Onion and Tomato

  • Onion contains less Vitamin C, and Vitamin K than Tomato.

The food types used in this comparison are Onions, raw and Tomatoes, red, ripe, raw, year round average.

Infographic

Onion vs Tomato 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
5
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%
Tomato
3
Magnesium Magnesium Calcium Calcium Potassium Potassium Iron Iron Copper Copper Zinc Zinc Phosphorus Phosphorus Sodium Sodium Manganese Manganese Selenium Selenium 7.9% 3% 21% 10% 20% 4.6% 10% 0.65% 15% 0%
Contains more CalciumCalcium +130%
Contains more PhosphorusPhosphorus +20.8%
Contains less SodiumSodium -20%
Contains more ManganeseManganese +13.2%
Contains more SeleniumSelenium +∞%
Contains more PotassiumPotassium +62.3%
Contains more IronIron +28.6%
Contains more CopperCopper +51.3%
~equal in Magnesium ~11mg
~equal in Zinc ~0.17mg

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
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 25% 0.12% 0.4% 0% 12% 6.2% 2.2% 7.4% 28% 0% 1% 14% 3.3%
Tomato
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 46% 50% 11% 0% 9.3% 4.4% 11% 5.3% 18% 0% 20% 11% 3.7%
Contains more Vitamin B1Vitamin B1 +24.3%
Contains more Vitamin B2Vitamin B2 +42.1%
Contains more Vitamin B5Vitamin B5 +38.2%
Contains more Vitamin B6Vitamin B6 +50%
Contains more FolateFolate +26.7%
Contains more Vitamin CVitamin C +85.1%
Contains more Vitamin AVitamin A +41550%
Contains more Vitamin EVitamin E +2600%
Contains more Vitamin B3Vitamin B3 +412.1%
Contains more Vitamin KVitamin K +1875%
~equal in Vitamin D ~0µg
~equal in Vitamin B12 ~0µg
~equal in Choline ~6.7mg

Macronutrient Comparison

Macronutrient breakdown side-by-side comparison
Onion
2
9% 89%
Protein: 1.1 g
Fats: 0.1 g
Carbs: 9.34 g
Water: 89.11 g
Other: 0.35 g
Tomato
3
4% 95%
Protein: 0.88 g
Fats: 0.2 g
Carbs: 3.89 g
Water: 94.52 g
Other: 0.51 g
Contains more ProteinProtein +25%
Contains more CarbsCarbs +140.1%
Contains more FatsFats +100%
Contains more OtherOther +45.7%
~equal in Water ~94.52g

Fat Type Comparison

Fat type breakdown side-by-side comparison
Onion
0
58% 18% 24%
Saturated Fat: Sat. Fat 0.042 g
Monounsaturated Fat: Mono. Fat 0.013 g
Polyunsaturated fat: Poly. Fat 0.017 g
Tomato
3
20% 22% 58%
Saturated Fat: Sat. Fat 0.028 g
Monounsaturated Fat: Mono. Fat 0.031 g
Polyunsaturated fat: Poly. Fat 0.083 g
Contains less Sat. FatSaturated Fat -33.3%
Contains more Mono. FatMonounsaturated Fat +138.5%
Contains more Poly. FatPolyunsaturated fat +388.2%

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
Tomato
1
48% 52%
Starch: 0 g
Sucrose: 0 g
Glucose: 1.25 g
Fructose: 1.37 g
Lactose: 0 g
Maltose: 0 g
Galactose: 0 g
Contains more SucroseSucrose +∞%
Contains more GlucoseGlucose +57.6%
~equal in Starch ~0g
~equal in Fructose ~1.37g
~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 Tomato
Lower in Sugar ok
Lower in Saturated Fat ok
Lower in Sodium ok
Lower in Glycemic Index ok
Lower in price ok
Lower in Cholesterol Equal
Rich in minerals Equal
Rich in vitamins Equal

All nutrients comparison - raw data values

Nutrient Onion Tomato Opinion
Calories 40kcal 18kcal Onion
Protein 1.1g 0.88g Onion
Fats 0.1g 0.2g Tomato
Vitamin C 7.4mg 13.7mg Tomato
Net carbs 7.64g 2.69g Onion
Carbs 9.34g 3.89g Onion
Magnesium 10mg 11mg Tomato
Calcium 23mg 10mg Onion
Potassium 146mg 237mg Tomato
Iron 0.21mg 0.27mg Tomato
Sugar 4.24g 2.63g Tomato
Fiber 1.7g 1.2g Onion
Copper 0.039mg 0.059mg Tomato
Zinc 0.17mg 0.17mg
Phosphorus 29mg 24mg Onion
Sodium 4mg 5mg Onion
Vitamin A 2IU 833IU Tomato
Vitamin A 0µg 42µg Tomato
Vitamin E 0.02mg 0.54mg Tomato
Manganese 0.129mg 0.114mg Onion
Selenium 0.5µg 0µg Onion
Vitamin B1 0.046mg 0.037mg Onion
Vitamin B2 0.027mg 0.019mg Onion
Vitamin B3 0.116mg 0.594mg Tomato
Vitamin B5 0.123mg 0.089mg Onion
Vitamin B6 0.12mg 0.08mg Onion
Vitamin K 0.4µg 7.9µg Tomato
Folate 19µg 15µg Onion
Choline 6.1mg 6.7mg Tomato
Saturated Fat 0.042g 0.028g Tomato
Monounsaturated Fat 0.013g 0.031g Tomato
Polyunsaturated fat 0.017g 0.083g Tomato
Tryptophan 0.014mg 0.006mg Onion
Threonine 0.021mg 0.027mg Tomato
Isoleucine 0.014mg 0.018mg Tomato
Leucine 0.025mg 0.025mg
Lysine 0.039mg 0.027mg Onion
Methionine 0.002mg 0.006mg Tomato
Phenylalanine 0.025mg 0.027mg Tomato
Valine 0.021mg 0.018mg Onion
Histidine 0.014mg 0.014mg
Fructose 1.29g 1.37g Tomato

Which food is preferable for your diet?

ok
ok
is better in case of low diet
Onion Tomato
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
8%
Onion
15%
Tomato
Minerals Daily Need Coverage Score
8%
Onion
9%
Tomato

Comparison summary

Which food is lower in Sugar?
Tomato
Tomato is lower in Sugar (difference - 1.61g)
Which food is lower in Saturated Fat?
Tomato
Tomato is lower in Saturated Fat (difference - 0.014g)
Which food contains less Sodium?
Onion
Onion contains less Sodium (difference - 1mg)
Which food is lower in glycemic index?
Onion
Onion is lower in glycemic index (difference - 8)
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 richer in minerals?
?
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.
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. Onion - https://fdc.nal.usda.gov/fdc-app.html#/food-details/170000/nutrients
  2. Tomato - https://fdc.nal.usda.gov/fdc-app.html#/food-details/170457/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.