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  6. Onion vs. Watermelon

Onion vs. Watermelon — In-Depth Nutrition Comparison

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How are Onion and Watermelon different?

  • Onion is higher than Watermelon in Vitamin B6, and Fiber.
  • Onion contains 6 times more Folate than Watermelon. Onion contains 19µg of Folate, while Watermelon contains 3µg.
  • Onion is lower in Sugar.

Onions, raw and Watermelon, raw types were used in this article.

Infographic

Onion vs Watermelon 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
6
:
3
Watermelon
Watermelon
Contains more Calcium +228.6%
Contains more Phosphorus +163.6%
Contains more Potassium +30.4%
Contains more Zinc +70%
Contains more Manganese +239.5%
Contains more Selenium +25%
Contains more Iron +14.3%
Contains less Sodium -75%
Equal in Magnesium - 10
Equal in Copper - 0.042
Onion
Calcium Iron Magnesium Phosphorus Potassium Sodium Zinc Copper Manganese Selenium 7% 8% 8% 13% 13% 1% 5% 14% 17% 3%
Watermelon
Calcium Iron Magnesium Phosphorus Potassium Sodium Zinc Copper Manganese Selenium 3% 9% 8% 5% 10% 1% 3% 14% 5% 3%
Contains more Calcium +228.6%
Contains more Phosphorus +163.6%
Contains more Potassium +30.4%
Contains more Zinc +70%
Contains more Manganese +239.5%
Contains more Selenium +25%
Contains more Iron +14.3%
Contains less Sodium -75%
Equal in Magnesium - 10
Equal in Copper - 0.042

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
Watermelon
Watermelon
Contains more Vitamin B1 +39.4%
Contains more Vitamin B2 +28.6%
Contains more Vitamin B6 +166.7%
Contains more Folate +533.3%
Contains more Vitamin K +300%
Contains more Vitamin A +28350%
Contains more Vitamin E +150%
Contains more Vitamin B3 +53.4%
Contains more Vitamin B5 +79.7%
Equal in Vitamin C - 8.1
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%
Watermelon
Vitamin A Vitamin E Vitamin D Vitamin C Vitamin B1 Vitamin B2 Vitamin B3 Vitamin B5 Vitamin B6 Folate Vitamin B12 Vitamin K 35% 1% 0% 27% 9% 5% 4% 14% 11% 3% 0% 1%
Contains more Vitamin B1 +39.4%
Contains more Vitamin B2 +28.6%
Contains more Vitamin B6 +166.7%
Contains more Folate +533.3%
Contains more Vitamin K +300%
Contains more Vitamin A +28350%
Contains more Vitamin E +150%
Contains more Vitamin B3 +53.4%
Contains more Vitamin B5 +79.7%
Equal in Vitamin C - 8.1

Macronutrient Comparison

Macronutrient breakdown side-by-side comparison
Onion
Onion
3
:
2
Watermelon
Watermelon
Contains more Protein +80.3%
Contains more Carbs +23.7%
Contains more Other +45.8%
Contains more Fats +50%
Equal in Water - 91.45
Onion
9% 89%
Protein: 1.1 g
Fats: 0.1 g
Carbs: 9.34 g
Water: 89.11 g
Other: 0.35 g
Watermelon
8% 91%
Protein: 0.61 g
Fats: 0.15 g
Carbs: 7.55 g
Water: 91.45 g
Other: 0.24 g
Contains more Protein +80.3%
Contains more Carbs +23.7%
Contains more Other +45.8%
Contains more Fats +50%
Equal in Water - 91.45

Fat Type Comparison

Fat type breakdown side-by-side comparison
Onion
Onion
0
:
3
Watermelon
Watermelon
Contains less Saturated Fat -61.9%
Contains more Monounsaturated Fat +184.6%
Contains more Polyunsaturated fat +194.1%
Onion
58% 18% 24%
Saturated Fat: 0.042 g
Monounsaturated Fat: 0.013 g
Polyunsaturated fat: 0.017 g
Watermelon
16% 36% 49%
Saturated Fat: 0.016 g
Monounsaturated Fat: 0.037 g
Polyunsaturated fat: 0.05 g
Contains less Saturated Fat -61.9%
Contains more Monounsaturated Fat +184.6%
Contains more Polyunsaturated fat +194.1%

Carbohydrate type comparison

Carbohydrate type breakdown side-by-side comparison
Onion
Onion
1
:
3
Watermelon
Watermelon
Contains more Glucose +24.7%
Contains more Sucrose +22.2%
Contains more Fructose +160.5%
Contains more Maltose +∞%
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
Watermelon
19% 25% 54%
Starch: 0 g
Sucrose: 1.21 g
Glucose: 1.58 g
Fructose: 3.36 g
Lactose: 0 g
Maltose: 0.06 g
Galactose: 0 g
Contains more Glucose +24.7%
Contains more Sucrose +22.2%
Contains more Fructose +160.5%
Contains more Maltose +∞%

Comparison summary table

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

All nutrients comparison - raw data values

Nutrient Onion Watermelon Opinion
Net carbs 7.64g 7.15g Onion
Protein 1.1g 0.61g Onion
Fats 0.1g 0.15g Watermelon
Carbs 9.34g 7.55g Onion
Calories 40kcal 30kcal Onion
Fructose 1.29g 3.36g Watermelon
Sugar 4.24g 6.2g Onion
Fiber 1.7g 0.4g Onion
Calcium 23mg 7mg Onion
Iron 0.21mg 0.24mg Watermelon
Magnesium 10mg 10mg
Phosphorus 29mg 11mg Onion
Potassium 146mg 112mg Onion
Sodium 4mg 1mg Watermelon
Zinc 0.17mg 0.1mg Onion
Copper 0.039mg 0.042mg Watermelon
Manganese 0.129mg 0.038mg Onion
Selenium 0.5µg 0.4µg Onion
Vitamin A 2IU 569IU Watermelon
Vitamin A RAE 0µg 28µg Watermelon
Vitamin E 0.02mg 0.05mg Watermelon
Vitamin C 7.4mg 8.1mg Watermelon
Vitamin B1 0.046mg 0.033mg Onion
Vitamin B2 0.027mg 0.021mg Onion
Vitamin B3 0.116mg 0.178mg Watermelon
Vitamin B5 0.123mg 0.221mg Watermelon
Vitamin B6 0.12mg 0.045mg Onion
Folate 19µg 3µg Onion
Vitamin K 0.4µg 0.1µg Onion
Tryptophan 0.014mg 0.007mg Onion
Threonine 0.021mg 0.027mg Watermelon
Isoleucine 0.014mg 0.019mg Watermelon
Leucine 0.025mg 0.018mg Onion
Lysine 0.039mg 0.062mg Watermelon
Methionine 0.002mg 0.006mg Watermelon
Phenylalanine 0.025mg 0.015mg Onion
Valine 0.021mg 0.016mg Onion
Histidine 0.014mg 0.006mg Onion
Saturated Fat 0.042g 0.016g Watermelon
Monounsaturated Fat 0.013g 0.037g Watermelon
Polyunsaturated fat 0.017g 0.05g Watermelon

Which food is preferable for your diet?

ok
ok
is better in case of low diet
Onion Watermelon
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
9%
Watermelon
Minerals Daily Need Coverage Score
8%
Onion
6%
Watermelon

Comparison summary

Which food contains less Sodium?
Watermelon
Watermelon contains less Sodium (difference - 3mg)
Which food is lower in Saturated Fat?
Watermelon
Watermelon is lower in Saturated Fat (difference - 0.026g)
Which food is cheaper?
Watermelon
Watermelon is cheaper (difference - $0.1)
Which food is lower in Sugar?
Onion
Onion is lower in Sugar (difference - 1.96g)
Which food is lower in glycemic index?
Onion
Onion is lower in glycemic index (difference - 61)
Which food is richer in minerals?
Onion
Onion 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. Onion - https://fdc.nal.usda.gov/fdc-app.html#/food-details/170000/nutrients
  2. Watermelon - https://fdc.nal.usda.gov/fdc-app.html#/food-details/167765/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.