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Medical Forum / General / Vision / May 2007

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Do Carrots Enhance Vision?

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Kazekage - 16 May 2007 14:21 GMT
Hi friends,

For quite some time now, I have been wondering whether the rumor is for real,
do carrots actually enhance night vision (and normal vision), or is this a
myth?

I was searching around for some information and found that -

According to Wikipedia:

"A common urban legend is that carrots aid a human being's night vision. It
is believed that disinformation introduced in 1940 by John "Cat's Eyes"
Cunningham during the Battle of Britain was an attempt to cover up the
discovery and use of radar technologies [5][6]. It reinforced existing German
folklore and helped to encourage children to eat the vegetable. Lack of
Vitamin A can, however, cause poor vision and can be restored by adding
Vitamin A back into the diet."

http://en.wikipedia.org/wiki/Carrot - Please see "Trivia".

According to World's Healthiest Foods:

"Better Vision

Beta-carotene helps to protect vision, especially night vision. After beta-
carotene is converted to vitamin A in the liver, it travels to the retina
where it is transformed into rhodopsin, a purple pigment that is necessary
for night-vision. Plus beta-carotene's powerful antioxidant actions help
provide protection against macular degeneration and the development of senile
cataracts, the leading cause of blindness in the elderly. "

http://www.whfoods.com/genpage.php?tname=foodspice&dbid=21#healthbenefits -
Please see "Better Vision".

Some clarification in this matter would be much appreciated.

Best,

-Kaze
Neil Brooks - 16 May 2007 17:51 GMT
> For quite some time now, I have been wondering whether the rumor is for real,
> do carrots actually enhance night vision (and normal vision), or is this a
> myth?

Now THIS is what's called "feeding the troll."

Here.  Have a carrot: http://tinyurl.com/3bach7
Mike Tyner - 16 May 2007 23:42 GMT
> For quite some time now, I have been wondering whether the rumor is for
> real,
> do carrots actually enhance night vision (and normal vision), or is this a
> myth?

You have to be pretty severely deficient in Vitamin A to suffer decreased
"night vision," deficient enough that your skin would dry out and start
cracking.

A healthy liver contains a year's worth of vitamin A and precursors. Polar
bear liver contains so much Vitamin A that you can overdose very easily.

> Beta-carotene helps to protect vision, especially night vision. After
> beta-
> carotene is converted to vitamin A in the liver, it travels to the retina
> where it is transformed into rhodopsin, a purple pigment that is necessary
> for night-vision.

Yes, that's what happens but rhodopsin is so important that the liver
sequesters Vitamin A and stores it.

> Plus beta-carotene's powerful antioxidant actions help
> provide protection against macular degeneration and the development of
> senile
> cataracts, the leading cause of blindness in the elderly. "

The benefits in macular degeneration are questionable:
http://www.medscape.com/viewarticle/553647

I'm not aware of any studies showing that Vitamin A prevents cataracts.

I _am_ aware of studies showing that smokers are MORE likely to get lung
cancer when taking supplementary vitamin A.

-MT
Kazekage - 18 May 2007 11:08 GMT
Cool, thx 4 clearing that up Mike.

Most appreciative,

-Kaze

"Now THIS is what's called "feeding the troll.""

Please sir, let's have some respect - not for me, but for yourself.
Neil Brooks - 18 May 2007 16:05 GMT
> "Now THIS is what's called "feeding the troll.""
>
> Please sir, let's have some respect - not for me, but for yourself.

Yeah.  How contemptible of me.

I posted a link to a scholar.google search that pointed you toward
loads of valid information.

Your diagnosis ... well ... it was just astoundingly insightful.
 
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