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Vitamin D status in indigenous populations: Part 1

Posted on: August 27, 2012   by  John Cannell, MD

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The most recent paper by Dr Martine Luxwolda and colleagues of the University Medical Center Groningen in Holland is so remarkable that we will be covering the paper in a three part series. These six scientists have discovered and investigated a few things that rock our understanding of vitamin D.

If you remember, this same group discovered that free-living hunter-gatherers around the equator have vitamin D blood levels of about twice the modern American, almost 50 ng/ml. How they ever got primitive hunter-gatherers to give their blood, I do not know but I’d like to have been around for the conversation: “You want to take my blood from me to do what?”

New study: Vitamin D levels of the Maasai and Hadzabe of Africa

Now, this same group studied more things in equatorial Tanzania, adding three tribes of fishing Bantus to their previous two tribes, the pastoral Maasai and the hunter-gatherer Hadzabe. They studied how vitamin D levels change with age, how warm water surface lake fish consumption affects vitamin D, including 25(OH)D₂ and 25(OH)D₃ levels, and finally  how levels change before, during, and after pregnancy in naturally living populations. We will be covering their paper in a three-part blog series.

Luxwolda MF, Kuipers RS, Kema IP, van der Veer E, Dijck-Brouwer DA, Muskiet FA. Vitamin D status indicators in indigenous populations in East Africa. Eur J Nutr. 2012 Aug 10. [Epub ahead of print]

To begin with, they found vitamin D levels increase, not decrease, with age! The 50 year-olds had higher levels than the 20 year olds. One of the highest levels was a 65 year old whose level was around 70 ng/ml. The highest level overall was in a pregnant woman (105 ng/ml), 5 points higher than the usual upper limit, a limit most practicing physicians think is toxic. To my knowledge, this is one of the highest “natural” levels ever measured. While it is interesting that levels reached this high, naturally, I would caution that this doesn’t mean this is what levels should be, but it does open up a can of worms for ranges of “normal” as measured by the conservative LCMS method, which is the method Luxwolda and colleagues used

In the USA, vitamin D levels fall rather precipitously with age, especially after retirement, although I have always wondered if the reason was not an impaired capacity to make it in the skin, but rather lack of sunlight causing the skin to lose its ability to make it (if you don’t use it you lose it). To my knowledge, this is the first study showing such a relationship with age. While not a strong association, it was significant. More importantly, they found no evidence vitamin D levels fell with age in populations of humans who get their vitamin D mainly from daily equatorial sunlight.

The series

4 Responses to Vitamin D status in indigenous populations: Part 1

  1. Ron Carmichael

    Is it possible that elevating D levels during gestation provides an intrinsic value not yet fully appreciated?
    Potentiation of neural development, perhaps? Neonatal immune system enhancements to combat environmental pathogens (malaria, sleeping sickness, etc.?) Science will tell, eventually, but for now…
    We can point to how “we” now know that a minute shortage in folic acid during pregnancy, for example, can lead to horrendous, profoundly bad birth defects in neural development.
    In 5 or 10 years it is possible that the medical community will accept, will know that likewise, a small shortage, say 40 billionths of a gram per ml in a mom-to-be, also causes horrendous bad effects. ( which some of us already accept as likely enough to be worth avoiding).
    We have strong suspicions already, but the day for clarity is fast approaching and I look for the day when the mounting slope for say, austism, ADD, etc. reverses from 1 in 88 births and retreats to a frequency that cannot be easily measured. For the cost of some regular sun exposure, or a few pennies in D3 capsules each day, or both. I find this a very exciting time, frankly.

  2. John Cannell, MD

    I am sure that elevated levels of 1,25 during pregnancy are not fully appreciated. In fact, due to substrate [25(OH)D] deficiency, most American women do not have such elevations in 1,25. Professor Bruce Hollis just recently discovered this tremendous increase if pregant women get 4,000 IU/day. It is even more interesting because the levels of 1,25 he found usually cause hypercalcemia but none of his pregnant women had it.

  3. Ron Carmichael

    Dr. J., there are clearly mechanisms in the human body that are not only NOT understood, but not even dreamt of…

  4. Rita and Misty

    Although vitamin D is not mentioned in the below-linked article, it is still a very fascinating piece on the Hadza hunter/gatherer society, and worth a read, imo:

    http://humanfoodproject.com/please-pass-microbes/

    🙂

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