Re: VItamin D Sufficiency

Rene said:

"John Sankey" <[email hidden]> wrote in message
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Quoted message said:

There certainily is a shortage of vitamin D among people who
don't drink fortified milk. In my studies, eating natural foods,
I'm finding it very difficult to get my RDA.

How about some cod liver oil?

Cod liver oil can provide only part of the required 20 to 25 micrograms
of vitamin D that is needed in winter time because it has not an optimal
ratio of vitamin D and vitamin A. It contains too much of vitamin A.

--
Juhana

"Juhana Harju" <[email hidden]> wrote in message
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Quoted message said:

Rene said:

"John Sankey" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

There certainily is a shortage of vitamin D among people who
don't drink fortified milk. In my studies, eating natural foods,
I'm finding it very difficult to get my RDA.

How about some cod liver oil?

Cod liver oil can provide only part of the required 20 to 25 micrograms
of vitamin D that is needed in winter time because it has not an optimal
ratio of vitamin D and vitamin A. It contains too much of vitamin A.

--
Juhana

I don't have any references, but I have heard that the RDA for vitamin A is
too low. Anyone else?

René

"Juhana Harju" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Rene said:

"John Sankey" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

There certainily is a shortage of vitamin D among people who
don't drink fortified milk. In my studies, eating natural foods,
I'm finding it very difficult to get my RDA.

How about some cod liver oil?

Cod liver oil can provide only part of the required 20 to 25 micrograms
of vitamin D that is needed in winter time because it has not an optimal
ratio of vitamin D and vitamin A. It contains too much of vitamin A.

--
Juhana

Oh, just found this:
http://www.mercola.com/forms/carlsons.htm

"Vitamin A is an important nutrient yet there is much confusion surrounding
its appropriate form, dosage and source. I always cringe when I hear people
who think they understand nutrition describing how vegetables like carrots
are excellent sources of vitamin A. There are no plant sources of vitamin
A -- it is only present in animal products.
Due to the commonly heard warnings that too much vitamin A is toxic and can
result in birth defects, liver abnormalities, and reduced bone mineral
density -- many people are afraid of taking too much of this nutrient.

What is rarely addressed, and must be considered along with these warnings,
is the TYPE of vitamin A. There is a big difference between synthetic
vitamin A and vitamin A from natural sources. Most cases of vitamin A
toxicity result from an excess intake of synthetic vitamin A in supplements,
NOT the natural form of retinol (vitamin A) found in cod liver oil.

Because cod liver oil contains vitamin D there's no need to worry about
vitamin A toxicity if you take it in cod liver oil. It is virtually
impossible to become toxic on vitamin A if you take it along with vitamin D.
As evidenced in a study published in the December 2003 American Journal of
Clinical Nutrition, vitamin D is associated with reduced vitamin A toxicity,
and the vitamin D appears to protect against retinal toxicity."

(http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14668278&dopt=Abstract)

René

Rene said:

"Juhana Harju" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Rene said:

"John Sankey" <[email hidden]> wrote in message
news:[email hidden]...
>
> There certainily is a shortage of vitamin D among people who
> don't drink fortified milk. In my studies, eating natural foods,
> I'm finding it very difficult to get my RDA.

How about some cod liver oil?

Cod liver oil can provide only part of the required 20 to 25
micrograms of vitamin D that is needed in winter time because it has
not an optimal ratio of vitamin D and vitamin A. It contains too
much of vitamin A.

--
Juhana

Oh, just found this:
http://www.mercola.com/forms/carlsons.htm

"Vitamin A is an important nutrient yet there is much confusion
surrounding its appropriate form, dosage and source. [...]

Mercola is not a reliable source.You might find good leads by reading
Mercola, but you have to check the information.

I remember that there are some studies showing that too much retinol,
the prevelent form of vitamin A in animal products, weakens bones. You
should limit taking cod liver oil to 5 ml or 1 teaspoon daily, no more.
That is a way of getting approximately 10 µg of vitamin D.

--
Juhana