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  6. Onion vs. Tomato

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
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.
Onion
Onion
5
:
4
Tomato
Tomato
Contains more Calcium +130%
Contains more Phosphorus +20.8%
Contains less Sodium -20%
Contains more Manganese +13.2%
Contains more Selenium +∞%
Contains more Iron +28.6%
Contains more Potassium +62.3%
Contains more Copper +51.3%
Equal in Magnesium - 11
Equal in Zinc - 0.17
Onion
Calcium Iron Magnesium Phosphorus Potassium Sodium Zinc Copper Manganese Selenium 7% 8% 8% 13% 13% 1% 5% 14% 17% 3%
Tomato
Calcium Iron Magnesium Phosphorus Potassium Sodium Zinc Copper Manganese Selenium 3% 11% 8% 11% 21% 1% 5% 20% 15% 0%
Contains more Calcium +130%
Contains more Phosphorus +20.8%
Contains less Sodium -20%
Contains more Manganese +13.2%
Contains more Selenium +∞%
Contains more Iron +28.6%
Contains more Potassium +62.3%
Contains more Copper +51.3%
Equal in Magnesium - 11
Equal in Zinc - 0.17

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
Onion
5
:
5
Tomato
Tomato
Contains more Vitamin B1 +24.3%
Contains more Vitamin B2 +42.1%
Contains more Vitamin B5 +38.2%
Contains more Vitamin B6 +50%
Contains more Folate +26.7%
Contains more Vitamin A +41550%
Contains more Vitamin E +2600%
Contains more Vitamin C +85.1%
Contains more Vitamin B3 +412.1%
Contains more Vitamin K +1875%
Onion
Vitamin A Vitamin E Vitamin D Vitamin C Vitamin B1 Vitamin B2 Vitamin B3 Vitamin B5 Vitamin B6 Folate Vitamin B12 Vitamin K 1% 1% 0% 25% 12% 7% 3% 8% 28% 15% 0% 1%
Tomato
Vitamin A Vitamin E Vitamin D Vitamin C Vitamin B1 Vitamin B2 Vitamin B3 Vitamin B5 Vitamin B6 Folate Vitamin B12 Vitamin K 50% 11% 0% 46% 10% 5% 12% 6% 19% 12% 0% 20%
Contains more Vitamin B1 +24.3%
Contains more Vitamin B2 +42.1%
Contains more Vitamin B5 +38.2%
Contains more Vitamin B6 +50%
Contains more Folate +26.7%
Contains more Vitamin A +41550%
Contains more Vitamin E +2600%
Contains more Vitamin C +85.1%
Contains more Vitamin B3 +412.1%
Contains more Vitamin K +1875%

Macronutrient Comparison

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

Fat Type Comparison

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

Carbohydrate type comparison

Carbohydrate type breakdown side-by-side comparison
Onion
Onion
2
:
1
Tomato
Tomato
Contains more Sucrose +∞%
Contains more Glucose +57.6%
Equal in Fructose - 1.37
Onion
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
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 Sucrose +∞%
Contains more Glucose +57.6%
Equal in Fructose - 1.37

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
Net carbs 7.64g 2.69g Onion
Protein 1.1g 0.88g Onion
Fats 0.1g 0.2g Tomato
Carbs 9.34g 3.89g Onion
Calories 40kcal 18kcal Onion
Fructose 1.29g 1.37g Tomato
Sugar 4.24g 2.63g Tomato
Fiber 1.7g 1.2g Onion
Calcium 23mg 10mg Onion
Iron 0.21mg 0.27mg Tomato
Magnesium 10mg 11mg Tomato
Phosphorus 29mg 24mg Onion
Potassium 146mg 237mg Tomato
Sodium 4mg 5mg Onion
Zinc 0.17mg 0.17mg
Copper 0.039mg 0.059mg Tomato
Manganese 0.129mg 0.114mg Onion
Selenium 0.5µg 0µg Onion
Vitamin A 2IU 833IU Tomato
Vitamin A RAE 0µg 42µg Tomato
Vitamin E 0.02mg 0.54mg Tomato
Vitamin C 7.4mg 13.7mg Tomato
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
Folate 19µg 15µg Onion
Vitamin K 0.4µg 7.9µg 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
Saturated Fat 0.042g 0.028g Tomato
Monounsaturated Fat 0.013g 0.031g Tomato
Polyunsaturated fat 0.017g 0.083g Tomato

Which food is preferable for your diet?

ok
ok
is better in case of low diet
Onion Tomato
Low Fats diet ok
Low Carbs diet ok
Low Calories 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
16%
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.