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Old 09-07-2007, 08:11 AM   #1 (permalink)
 
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We have underestimated the importance of Vitamin D

In the past 10 years, we have learned that vitamin D is much more important for health than previously thought and that up to 50 percent of adults and children are at risk of being vitamin D deficient.

This should actually not come as a surprise since humans have historically depended on sunlight for their vitamin D and now most people no longer get enough sunlight to obtain adequate amounts of this vitamin. In fact, we are more concerned about skin cancer than we are about obtaining enough vitamin D. Other risk factors for vitamin D deficiency include obesity, old age, medications, overuse of sunscreen, dark pigmentation and covering all skin with clothing.

Vitamin D is important for several reasons. A deficiency in vitamin D causes rickets and prevents children from reaching their peak bone mass. In adults, the lack of vitamin D contributes to osteoporosis and the painful bone disease osteomalacia.

We have suspected for a long time that vitamin D deficiency might also cause heart disease. A New Zealand study reported in 1990 showed that heart attack victims had lower levels of vitamin D in their bodies than people who did not have heart attacks. A 1998 study showed that heart attacks increased by 53 percent during winter months when sunlight is less available.

More recent studies have found that adequate levels of vitamin D helps reduce inflammation, lower blood pressure and improve insulin sensitivity. These variables all decrease the risk of heart disease. A study of Japanese dialysis patients indicates that returning the patients vitamin D to appropriate levels reduced heart attacks and death from heart disease.

In a recent study carried out with healthy postmenopausal women in Nebraska, the effect of calcium and vitamin D supplementation on the reduction of cancer incidence was investigated. While both substances on their own decreased cancer risk, calcium and vitamin D together decreased the risk of cancer down to 23 percent of the risk of those women who did not take either supplement. In another study, women with the highest levels of vitamin D had one fifth the risk of breast cancer compared.

To obtain adequate amounts of vitamin D, consider the following.

Get some sun. According to some research, while sun exposure does increase your risk of relatively benign skin cancer, it decreases your risk of most deadly skin cancers such as melanoma. To obtain vitamin D, allow yourself no more than 15 minutes of unprotected sun exposure in the early morning or late afternoon if you are light skinned, and 30 minutes if you are dark skinned.

Take a good multivitamin daily. It will probably have 200 IUs of vitamin D. Many experts recommend that we should consume 1,000 IUs per day so consider a vitamin D supplement. Consuming more than 4,000 IUs overall may result in toxic effects.

Eat a diet with complex carbohydrates and whole foods. Cold-water fish such as salmon, tuna and sardines are a good source of vitamin D as well as foods such as milk that are fortified with vitamin D.

If you think you are deficient in vitamin D, consider getting a blood test from your doctor and discuss adding a vitamin D supplement to your diet.

Stephen Roberts is an associate professor in the UT Department of Public Health and Homeland Security

SOURCE: http://www.toledofreepress.com/?id=6300
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Old 09-07-2007, 06:03 PM   #2 (permalink)
 
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Re: We have underestimated the importance of Vitamin D

While I agree with much of this article there are a few points I would like to take issue with.
For a start the phrase "that up to 50 percent of adults and children are at risk of being vitamin D deficient. "
Many people will not understand that "deficient" has a different meaning from "insufficient"

If we look at the UK statistics we find that whatever method of assessing hypovitamtosis d (vitamin d deficiency) the point we shouldn't overlook is that MOST UK ADULTS have insufficient Vitamin d status. If the AVERAGE vitamin D status peaks at 72nmol/L and we know that 80nmol/L is the level at which maximum calcium absorption is attained. 100nmol/L is the level at which all the bodies systems requiring Vitamin D can be supplied 125nmol/L the level associated with maximum physical performance and 137.5nmol/l the level associated with the lowest cancer incidence, we have to assume that ALL the UK white adults have around half the Vitamin D status than is ideal for cancer prevention. (If the situation for UK white adults is bad then for UK brown adults it is very bad and for blacks it is appalling.)

To obtain vitamin D, allow yourself no more than 15 minutes of unprotected sun exposure in the early morning or late afternoon if you are light skinned, and 30 minutes if you are dark skinned.
What makes Vitamin d in the skin?
The action of UVB rays.
What is the point of telling people to sunbathe when there is little or no UVB reaching the ground?
In the UK there is NO UVB reaching the earth early morning and late afternoon. All you get is UVA, fine for tanning but no use at all for vitamin D. This article explains the science of Vitamin D synthesis.OK it's for lizards but the process is the same for us.

I agree that you need to limit the length of your sun (uvb) sessions as further heat applied to vitamin D converts it to suprasterols that are not usable, but according to Vieth 5mins full body sun exposure raises 1000iu therefore it takes 20 minutes turning every 5 to raise the 4000iu your body uses every day and you will then have to cool off, go inside , cover up and allow the skin to cool down before you repeat the process to build up stores for the Winter or Correct an Insufficiency situation.

experts recommend that we should consume 1,000 IUs per day so consider a vitamin D supplement.
As far as the UK adult is concerned you need to understand that 400iu raises status by between 7-12nmol/L average this to 9nmol/L in the Winter the average UK white adult has 40nmol/L and requires for maximum cancer protection 137.5nmol/l approx 100nmol/.L raise. 1000iu is inadequate. 4000iu is getting nearer 5000iu is probably necessary. In Summer when the average status is 72nmol/l only 7x 400iu would be needed but that is 2800iu 1000iu is simply inadequate.

Consuming more than 4,000 IUs overall may result in toxic effects.
this is codswallop.
Risk assessment for vitamin D shows us that 40,000iu is dangerous if taken daily for some months. A tenth of that amount is actually what our body actually uses every day.

Eat a diet with complex carbohydrates and whole foods. Cold-water fish such as salmon, tuna and sardines are a good source of vitamin D as well as foods such as milk that are fortified with vitamin D. Of course this is common sense but don't think for one moment it can significantly alter your vitamin d status. Yes every little helps but compared with your 4000iu/daily need the 400iu you can pick up from food is relatively trivial. A whole tin of sardines in tomato sauce will provide 300iu a glass of milk 100iu if you are lucky. No one is going to eat 13 tins of sardines in tomato sauce a day or drink 40 glasses of fortified milk, It isn't possible.

Stephen Roberts is an associate professor in the UT Department of Public Health and Homeland Security He may well be but he doesn't appear to have very much common sense.
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Old 09-08-2007, 03:50 AM   #3 (permalink)
 
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Re: We have underestimated the importance of Vitamin D

I thought I had posted a reply to the above post to clarify some of the information Stephen Roberts presented but the post hasn't appeared.

It is surely reasonable to point out that "deficiency" is a different state than " insufficiency" and that while 50% of the population may be clinically Deficient the others should be aware that they may have insufficient status.

This paper shows the UK situation where the average person has 40nmol/L in the Winter and 70nmol/l in the Summer and thus at NO time in the year meets the 80nmol/l target for optimum calcium uptake or the 100nmol/L level required to ensure all your bodies system function properly or the 137.5nmol/L 55ng/ml associated with the lowest rate of cancer incidence

If the AVERAGE UK adult has a Vitamin D status 50% below that associated with the lowest rate of cancer incidence it is important that they ALL know that they may be insufficient, most people reading that 50% are deficient will assume this applies to other people and will not appreciate that they also need to raise their vitamin D status because although they may not be deficient they are almost certainly insufficient.
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Old 09-08-2007, 03:52 AM   #4 (permalink)
 
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Re: We have underestimated the importance of Vitamin D

This paper shows the UK situation where the average person has 40nmol/L in the Winter and 70nmol/l in the Summer and thus at NO time in the year meets the 80nmol/l target for optimum calcium uptake or the 100nmol/L level required to ensure all your bodies system function properly or the 137.5nmol/L 55ng/ml associated with the lowest rate of cancer incidence

If the AVERAGE UK adult has a Vitamin D status 50% below that associated with the lowest rate of cancer incidence it is important that they ALL know that they may be insufficient, most people reading that 50% are deficient will assume this applies to other people and will not appreciate that they also need to raise their vitamin D status because although they may not be deficient they are almost certainly insufficient.
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Old 09-08-2007, 01:08 PM   #5 (permalink)
 
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Re: We have underestimated the importance of Vitamin D

Thanks for taking the time to post Ted. Whenever posts have links they go thru moderation to verify the links first and may not appear right away. :)
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Old 09-08-2007, 01:10 PM   #6 (permalink)
 
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Re: We have underestimated the importance of Vitamin D

so you wanna carve up some dermatologists?
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Old 09-09-2007, 03:18 PM   #7 (permalink)
 
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Re: We have underestimated the importance of Vitamin D

Sorry for the repeat posts. I thought it was either my PC playing up or the posts hadn't arrived or had been moderated off for some reason.

I've written to Stephen Roberts to ask him to explain why he thinks 4,000 IUs overall may result in toxic effects I'll be surprised if he answers but anyone whose interested may like to read .Safety of vitamin D3 in adults with multiple sclerosis where you can see they started with 28000iu/wk (7000iu/d) and built up to 280 000 IU/wk(40,000iu/d) Not that I would ever suggest anyone here tries 40,000iu/daily (it will eventually produce hypercalcemia but clearly takes longer than 28weeks to do so). The point is that if it takes over 28weeks to cause trouble at 40,000iu daily taking one tenth that amount is unlikely to cause problems. Try drinking tens times the daily recommended amount of Water every day and you will have serious problems very quickly but we don't go around saying drinking water can kill you.
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