Friday, August 26, 2011

Natural food-Fruit Vitamin C Content



All values in the chart below are rounded to the nearest whole number. Exactly half a milligram is rounded up, not down.
Most of the information is from the USDA Nutrient database for standard reference, release 12 (1998). There is occasional wide variation in results between different investigators. For example, the USDA Nutrient database lists fresh Jujube at 69 mg vitamin C in every 100 mg flesh, where investigators at the University of California listed around 500 mg/100 grams. In the case of jujube, this may be caused because the fruit increase in vitamin C content with maturation, or it may be that different varieties tested have different levels, or a combination of both.

So these figures should not be taken as 'gospel', but rather as indicative. The vitamin C content of many fruit is higher when it is slightly immature, and declines as the fruit hits peak ripeness. For a few, such as the jujube fruit already mentioned, the vitamin C content does the opposite, it rises with increased ripeness. Vitamin C content also decreases with storage. For example, the kiwifruit is an exceptionally rich source of vitamin C - a medium sized fruit has 74 mg, but a kiwifruit that has been coolstored for a while has a vitamin C content of 57 mgs. Still excellent, but less excellent! 

  
In terms of consumer acceptability and likely frequency of eating, the yellow fleshed kiwifruit can be considered the best source of vitamin C in commercially available fruit. 
  
Generally far more important than ripening and storage effects, is the effect of the variety of fruit. In some fruits, the amount of 
vitamin C varies between different varieties of the same species. The tropical guava, Psidium guajava, is regarded as an excellent source of vitamin C, but there is great variation in vitamin C levels amongst the various cultivated varieties. For example, the variety 'Donaldson' has 372 mg/100 grams of flesh, but the variety 'Supreme' has only 44 mg/100 gms (some South African pink guava cultivars grown for the canning industry are said to have an astonishing 400 mg/100 gms!). Again, for mangoes, the varieties 'Pirie' and 'Haden' are only 'fair' sources, where other varieties are 'excellent' sources.


The current (1989) recommended daily allowance (RDA) for an adult is 60 milligrams per day (this is based on the amount of vitamin C needed to prevent clinical scurvy and provide body stores sufficient to prevent scurvy for around 30 days, plus "a margin of safety"). 

Pregnant and lactating women are regarded as needing more than this. Some people claim that the optimum intake is 500 mg per day. Recent test on healthy males clearly show 200mg per day is required to maintain tissues at full saturation, but without excreting vitamin C. Women have not been tested. At April 1999, it is being 'officially' recommended, based on new information, that the RDA ought to be changed to 120 milligrams per day.[4
  
The daily intake for a gatherer hunter would depend on the season, the particular ecosystem the tribe was living in, and the size of the family unit that shared whatever resource was available. The daily intake would probably have been well in excess of the RDA at times of year when fruit and greens were relatively abundant, and at other times may well have been much less. Either way, it is unlikely we took in 500 mg per day every day. The 500 mg so called 'optimum' probably reflects the need for a city living human to protect against stressful living, and the now wide exposure to damaging environmental chemicals. Such a level can only realistically be obtained by taking supplemental vitamin C.

Nutritionists generally regard any 'serving' of food that provides 10% to 25% of the daily vitamin C need in a relatively low calorie package as a 'good' source. The serving size most of us choose is pretty uniform - most of us would eat one apple, half an avocado in a salad, half a medium sized tomato as part of a salad, one banana, a slice of melon, and so on. On this basis, some fruits, such as kiwifruit, are quite outstanding, in that they provide more than the RDA in one relatively small fruit. Other fruits, such as oranges, are both very good sources and are also cheap, and pack in a lunch without crushing or leaking. So their importance is much greater than their vitamin C content alone would suggest.
Vitamin C is an important anti-oxidant, helps protect against cancers, heart disease, stress, it is part of the cellular chemistry that provides energy, it is essential for sperm production, and for making the collagen protein involved in the building and health of cartilage, joints, skin, and blood vessels. Vitamin C helps in maintaining a healthy immune system, it aids in neutralizing pollutants, is needed for antibody production, acts to increase the absorption of nutrients (including iron) in the gut, and thins the blood. Just to mention its most important functions.
Any fruit, or natural portion (e.g. slice of melon, or a handful of berries) in the chart below which has from 6 to 15 milligrams of vitamin C and is not highly packed with sugars is regarded as a 'good' source. Some very sweet fruit, such as apples, can be regarded as fairly good sources because they have more than 6 milligrams a serving, but not much more. Some very acid fruit, for example Surinam cherry, have 'good' absolute levels in the flesh, but are both small and unpalatable, so only one or two would ever be eaten at any one time. Therefore they are ranked lower than more acceptable fruit of a similar size and vitamin C content.
Any fruit, or natural portion (e.g. slice of melon, or a handful of berries) that gives from about 15 milligrams to about 30 milligrams can be considered a 'very good' source of vitamin C
When a fruit or natural portion (e.g. slice of melon, or a handful of berries) has more than about 30 milligrams per serving, it is an 'excellent' source of Vitamin C.
Obviously, when a single serving supplies a lot better than the current RDA of vitamin C, it is an 'exceptional' source, at least in my view!

The half ripe fruit of the camu camu, a shrubby tree of the Amazon, has the distinction of having the highest recorded levels of any fruit, surpassing even the highest levels recorded in the acerola. At 2.7 grams of ascorbic acid per 100 grams of fruit, the ascorbic acid content is nothing short of astounding! ('Ascorbic acid' is the technical term for vitamin C). 

  
If you can add vitamin C analysis of fruit not listed here I would be pleased to receive it. Email me at 
removethespamtrapfirsttempre1@naturalhub.com


 

Fruit

Latin name

mg vitamin C
/ 100 grams

mg vitamin C
per average 
size fruit/slice*

Ranking

Notes

     **Acerola 

Malpighia glabra

1,677

80

exceptional*

 Apple

Malus sylvestris 

 6

 8

fairly good

 Apricot

Prunus armeniaca 

 10

 4

 -

 Apricot, canned

 Prunus armeniaca 

 3

 2

 -

Asian pear

Pyrus serotina

4

5

 -

 Avocado

Persea americana 

  8 

16 

fairly good

 Banana

Musa X paradisiaca 

 9

11

good

Babaco

Carica pubescens x stipulata forma 'pentagona'

21 to 32

21 to 32

very good

[1]
Barbados CherryMalpighia glabra 1,678112exceptional[7]

Bilberry

Vaccinium myrtillus

1

     0.01*(estim)

-

[1]

**Baobab

Adonsonia digitata

150 to 499

100

exceptional

[2]

 Breadfruit

Artocarpus altilis 

 29

  28*

very good

Blackberry

Rubus sp.

6

         0.6(estim)

-

[1]

Blackcurrant

Ribes nigrum

155 to 215

1.5 to 2*(estim.)

excellent

[1]

Blueberry

Vaccinium sp

1.3 to 16.4

no data*

-

[3]

**Camu Camu

Myrciaria dubia

2,700

no data

astounding

 Carambola

Averrhoa carambola 

21

19 

very good

Casimiroa

Casimiroa edulis

30

15*

very good

 Crabapple

Malus sp. 

8

       2 (estim.)

 -

Cherimoya

Annona cherimola

9

 10*

fairly good

Custard apple

Annona reticulata

19

no data

very good

Feijoa

Feijoa sellowiana

25

13

good

 

Feijoa

Feijoa sellowiana 
cv. 'Mammoth'

31

16

very good

[6]

Feijoa

Feijoa sellowiana
cv.'Triumph'

27

14

good

[6]

Fig

Ficus carica

2

1

 -

Grape, slip skin 

Vitis spp

4

         .01

 -

Grape, european

Vitis vinifera

11

        .60

good*

Grapefruit

Citrus paradisi

34

 44*

excellent

**Guava, Cattley 

Psidium cattleianum

37

2

very good*

Guava, tropical

Psidium guajava

183

165

exceptional

**Java plum

Syzgium cumini

14

      .42

 -

Jujube

Ziziphus jujuba

500

no data

exceptional*
Kakadu PlumTerminalia ferdinandiana2300 to 315060 *(estim)excellent*[8]

**Kei apple

Dovyalis caffra

117

17

   excellent*

Kiwano™

Cucumis metuliferus

0.5

0.5

-

[1]

Kiwifruit, green

Actinidia deliciosa

98

74

exceptional

Kiwifruit, yellow

Actinidia chinensis

120 to 180

108 to 162

exceptional

Lemon juice

Citrus limon

46

3*

 -

Lime juice

Citrus aurantifolia

29

1*

 -

Longan

Dimocarpus longan

84

3*

good

Loquat

Eriobotrya japonica

1

      .5

 -

Lychee

Litchi chinensis

72

7*

very good

Mango

Mangifera indica

28

57

excellent
         **Marula
Sclerocarya birrea

68

60(estim)

excellent

Medlar

Mespilus germanica

0.3

      0.15(estim)

-

[1]

Melon, cantaloupe

Cucumis melo

42

29*

very good

Melon, honeydew

Cucumis melo

25

20*

very good

**Muntingia

Muntingia calabura

80

4*(estim)

excellent

**Natal plum

Carissa macrocarpa

38

8

good

Orange

Citrus sinensis

53

70

excellent

Opuntia cactus

Opuntia spp.

23

no data

very good?

 

Papaya

Carica papaya

62

47*

excellent

**Pawpaw/Asimina

Asimina triloba

14

28(estim)

good†

Passionfruit, purple

Passiflora edulis

30

5

 -

Peach

Prunus persica

7

6

 -

Peach, canned

Prunus persica

3

3

 -

Pear

Pyrus communis

4

7

 -

**Persimmon, American

Diospyros virginiana

66

13*(estim.)

excellent

Persimmon, Oriental

Diospyros kaki

40

40*(estim.)

excellent

Pineapple

Ananus comosus

15

13

good

Plum

Prunus sp

10

6

fairly good
QuinceCydonia oblonga1515good

Raspberry

Rubus spp.

25

       .5

-

Raspberry

Rubus spp.

23 to 32

0.7 to 1*

very good

[1]

Redcurrant

Ribes sativum

58 to 81

0.58 to 0.81*(estim)

good

[1]

Rosehip

Rosa pomifera cv.'Karpatia'

1,500

45(estim.)

excellent

[5]

Rosehip

Rosa sp. cv.'Pi Ro 3'

1,150

34(estim.)

very good

[5]

Rosehip

Rosa sp. cv.'Vitaminnyj-VNIVI'

2,000 to
2,500

60 to 75(estim.)

excellent

[5]

**Surinam cherry

Eugenia uniflora

26

2

 -

Sapodilla

Manilkara zapota

15

25

very good

Strawberry

Fragaria x ananassa

57

7*

very good

Tangerine/Mandarin

Citrus reticulata

31

26

very good

Tamarillo, red

Cyphomandra betaceae

40

40

excellent

Tamarillo, red

Cyphomandra betaceae

31

22

very good

[6]

Tamarillo, yellow

Cyphomandra betaceae

33

30

very good

[6]

Tamarillo, yellow

Cyphomandra betaceae

31

22

very good

 

Tomato

Lycopersicon sp

19

23

very good

Watermelon

Citrullus lanatus

10

27

very good
 
* The values are for one whole fruit, but no one (that I would want to know) eats a whole medium sized watermelon at a sitting, so for these larger fruit the value is for a slice, a 'slice' being, very generally, about an eighth of a medium sized fruit, or a quarter of a 'smaller' fruit. 
In the particular case of lemon and lime, the 'slice' value is juice of one wedge. 
For a few small fruit, such as Kei apple, the ranking is adjusted upward where the fruit mg/100 gram analysis shows it has large amounts of vitamin C,  but the small size of the fruit gives it a lower per fruit vitamin C content. You are likely to eat more than one at a serving. In the case of tiny fruit, like red or black currants, a lot more, but probably still only 20-30 raw fruit, especially if they are a bit acid..

  

** You won't find these fruit in the shops. They are natural environment fruits that we have not domesticated for one reason or another. Most will never be domesticated. Some can be grown at home in the backyard. 
  
† Asimina fruits range in vitamin C content from about 7mg/100 grams edible to about 21mg/100 grams, depending on the variety. Therefore some varieties are a 'good' source of vitamin C, others are a 'very good' source. 

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