Grapefruit vs. Onion
Nutrition comparison of Grapefruit and Onion
Ever wonder how your favorite foods stack up against each other in terms of nutrition?
We compared the nutritional contents of
grapefruit
versus
onion
(100g each)
below using 2020 USDA and NIH data[1].
For a quick recap of significant nutrients and differences in grapefruit and onion:
- Grapefruit has more pantothenic acid, however, onion contains more Vitamin B6.
- Grapefruit is an excellent source of Vitamin C.
USDA sources for nutritional information: Grapefruit (Grapefruit, raw, pink and red, all areas) and Onion (Onions, raw) . Have a correction or suggestions? Shoot us an email.
Calories and Carbs
calories
Onion and grapefruit contain similar amounts of calories - onion has 40 calories per 100 grams and grapefruit has 42 calories.
For macronutrient ratios, grapefruit is lighter in protein, heavier in carbs and similar to onion for fat. Grapefruit has a macronutrient ratio of 7:91:3 and for onion, 11:87:3 for protein, carbohydrates and fat from calories.
Macro Ratios from Calories:
| Grapefruit | Onion | |
|---|---|---|
| Protein | 7% | 11% |
| Carbohydrates | 91% | 87% |
| Fat | 3% | 3% |
| Alcohol | ~ | ~ |
carbohydrates
Onion and grapefruit contain similar amounts of carbs - onion has 9.3g of total carbs per 100 grams and grapefruit has 10.7g of carbohydrates.
dietary fiber
Onion and grapefruit contain similar amounts of dietary fiber - onion has 1.7g of dietary fiber per 100 grams and grapefruit has 1.6g of dietary fiber.
sugar
Onion and grapefruit contain similar amounts of sugar - onion has 4.2g of sugar per 100 grams and grapefruit has 6.9g of sugar.
Protein
protein
Onion and grapefruit contain similar amounts of protein - onion has 1.1g of protein per 100 grams and grapefruit has 0.77g of protein.
Fat
saturated fat
Both onion and grapefruit are low in saturated fat - onion has 0.04g of saturated fat per 100 grams and grapefruit has 0.02g of saturated fat.
Vitamins
Vitamin C
Grapefruit is an excellent source of Vitamin C and it has 322% more Vitamin C than onion - onion has 7.4mg of Vitamin C per 100 grams and grapefruit has 31.2mg of Vitamin C.
Vitamin A
Grapefruit has more Vitamin A than onion - grapefruit has 58ug of Vitamin A per 100 grams and onion does not contain significant amounts.
Vitamin E
Onion and grapefruit contain similar amounts of Vitamin E - onion has 0.02mg of Vitamin E per 100 grams and grapefruit has 0.13mg of Vitamin E.
Vitamin K
Onion and grapefruit contain similar amounts of Vitamin K - onion has 0.4ug of Vitamin K per 100 grams and grapefruit does not contain significant amounts.
The B Vitamins
Grapefruit has more pantothenic acid, however, onion contains more Vitamin B6. Both grapefruit and onion contain significant amounts of thiamin, riboflavin, niacin and folate.
| Grapefruit | Onion | |
|---|---|---|
| Thiamin | 0.043 MG | 0.046 MG |
| Riboflavin | 0.031 MG | 0.027 MG |
| Niacin | 0.204 MG | 0.116 MG |
| Pantothenic acid | 0.262 MG | 0.123 MG |
| Vitamin B6 | 0.053 MG | 0.12 MG |
| Folate | 13 UG | 19 UG |
Minerals
calcium
Onion and grapefruit contain similar amounts of calcium - onion has 23mg of calcium per 100 grams and grapefruit has 22mg of calcium.
iron
Onion and grapefruit contain similar amounts of iron - onion has 0.21mg of iron per 100 grams and grapefruit has 0.08mg of iron.
potassium
Onion and grapefruit contain similar amounts of potassium - onion has 146mg of potassium per 100 grams and grapefruit has 135mg of potassium.
Antioxidants and Phytonutrients
flavonoids
Naturally occuring in fruits and vegetables, flavonoids are associated with many health benefits and used in a variety of medicinal and pharmaceutical applications. [2][3]
For specific flavonoid compounds, grapefruit has more luteolin than onion per 100 grams, however, onion contains more kaempferol, quercetin and isorhamnetin than grapefruit per 100 grams. Both grapefruit and onion contain small amounts of myricetin.
| Grapefruit | Onion | |
|---|---|---|
| luteolin | 0.6 mg | 0.02 mg |
| kaempferol | 0.01 mg | 0.65 mg |
| myricetin | 0.01 mg | 0.03 mg |
| Quercetin | 0.33 mg | 20.3 mg |
| apigenin | ~ | 0.01 mg |
| isorhamnetin | ~ | 5.01 mg |
carotenoids
Carotenoids are micronutrients commonly found in plants and some animal products. An example is beta-carotene, the notable carotenoid which is a popular source of Vitamin A.[4][5]
For specific types of carotenoids, both grapefruit and onion contain small amounts of lutein + zeaxanthin.
| Grapefruit | Onion | |
|---|---|---|
| beta-carotene | 686 UG | 1 UG |
| alpha-carotene | 3 UG | ~ |
| lycopene | 1419 UG | ~ |
| lutein + zeaxanthin | 5 UG | 4 UG |
Omega-3 and Omega-6
omega 3s
For omega-3 fatty acids, both grapefruit and onion contain small amounts of alpha linoleic acid (ALA).
| Grapefruit | Onion | |
|---|---|---|
| alpha linoleic acid | 0.008 G | 0.004 G |
| Total | 0.008 G | 0.004 G |
omega 6s
Comparing omega-6 fatty acids, both grapefruit and onion contain small amounts of linoleic acid.
| Grapefruit | Onion | |
|---|---|---|
| linoleic acid | 0.029 G | 0.013 G |
| Total | 0.029 G | 0.013 G |
Customize your serving size
The comparison below is by common portions, e.g. cups, packages. You can also see a more concrete comparison by weight at equal weight (by grams) comparison.
Note: The specific food items compared are: Grapefruit (Grapefruit, raw, pink and red, all areas) and Onion (Onions, raw) .
Grapefruit g
()
|
Daily Values (%) |
Onion g
()
|
|||||
|---|---|---|---|---|---|---|---|
| KCAL % |
|
5% | calories | 5% |
|
KCAL % | |
| G % |
|
5% | carbohydrates | 5% |
|
G % | |
| G % |
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5% | dietary fiber | 5% |
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G % | |
| G | 5% | sugar | 5% | G | |||
| G % |
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5% | total fat | 5% |
|
G % | |
| G % |
|
5% | saturated fat | 5% |
|
G % | |
| G | 5% | monounsaturated fat | 5% | G | |||
| G | 5% | polyunsaturated fat | 5% | G | |||
| G | 5% | trans fat | 5% | G | |||
| MG | 5% | cholesterol | 5% | MG | |||
| MG % |
|
5% | sodium | 5% |
|
MG % | |
| 5% | Vitamins and Minerals | 5% | |||||
| UG % |
|
5% | Vitamin A | 5% |
|
UG % | |
| MG % |
|
5% | Vitamin C | 5% |
|
MG % | |
| IU % |
|
5% | Vitamin D | 5% |
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IU % | |
| MG % |
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5% | calcium | 5% |
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MG % | |
| MG % |
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5% | iron | 5% |
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MG % | |
| MG % |
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5% | magnesium | 5% |
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MG % | |
| MG % |
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5% | potassium | 5% |
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MG % | |
| MG % |
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5% | thiamin (Vit B1) | 5% |
|
MG % | |
| MG % |
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5% | riboflavin (Vit B2) | 5% |
|
MG % | |
| MG % |
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5% | niacin (Vit B3) | 5% |
|
MG % | |
| MG % |
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5% | Vitamin B6 | 5% |
|
MG % | |
| MG % |
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5% | pantothenic acid (Vit B5) | 5% |
|
MG % | |
| UG % |
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5% | folate (Vit B9) | 5% |
|
UG % | |
| UG % |
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5% | Vitamin B12 | 5% |
|
UG % | |
| MG % |
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5% | Vitamin E | 5% |
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MG % | |
| UG % |
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5% | Vitamin K | 5% |
|
UG % | |
| G % |
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5% | protein | 5% |
|
G % | |
| UG % |
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5% | biotin (Vit B7) | 5% |
|
UG % | |
| MG % |
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5% | choline | 5% |
|
MG % | |
| MG % |
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5% | chlorine | 5% |
|
MG % | |
| UG % |
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5% | chromium | 5% |
|
UG % | |
| MG % |
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5% | copper | 5% |
|
MG % | |
| UG % |
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5% | fluoride | 5% |
|
UG % | |
| UG % |
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5% | iodine | 5% |
|
UG % | |
| MG % |
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5% | manganese | 5% |
|
MG % | |
| UG % |
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5% | molybdenum | 5% |
|
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| MG % |
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5% | phosphorus | 5% |
|
MG % | |
| UG % |
|
5% | selenium | 5% |
|
UG % | |
| MG % |
|
5% | zinc | 5% |
|
MG % | |
| G | 5% | Water | 5% | G | |||
| G | 5% | Starch | 5% | G | |||
| G | 5% | Alcohol | 5% | G | |||
FAQ
Does onion or grapefruit contain more calories in 100 grams?Onion and grapefruit contain similar amounts of calories - onion has 40 calories in 100g and grapefruit has 42 calories.
Does onion or grapefruit have more carbohydrates?
By weight, onion and grapefruit contain similar amounts of carbs - onion has 9.3g of carbs for 100g and grapefruit has 10.7g of carbohydrates.