|Posted by Chad on December 22, 2011 at 11:45 AM|
Below is an excerpt from a leading vitamin D researcher Dr. Richard Haney interviewed by Dr. Chris Mohr. Anyone wanting to read the truth about vitamin D, here it is...
"Dr. Chris: Alright, great. So let’s get right into it. First of all, vitamin D, we keep hearing a lot about that it’s an epidemic, a worldwide deficiency and just in your practice as a researcher and a scientist what have you seen with your research subjects in terms of rates of deficiency?
Dr. Heaney: Well, most of the adults that we work with are vitamin D deficient, at least by my standards, and although I don’t personally work with children or young people, it’s worth noting that an article in the Journal of Pediatrics just about a year ago found that between 60 and 98 percent of teenage girls, for example, both black, Hispanic, and white, were vitamin D deficient. So between 60 and 98 percent. That would be consistent with what we seem to see in adults as well. Probably pushing toward the high end of that. But, of course, if you define vitamin D adequacy by a very low 25-hydroxy D level, then fewer people are g oing to show up as deficient by that criteria.
Dr. Chris: Right. Great point. And for those who don’t know, you’re located in Nebraska, so you’re pretty far north.
Dr. Heaney: Yes, we’re at 41 degrees north latitude. Just about halfway between the Canadian border and the gulf. So it’s not that far north, but we don’t get useful sun exposure for about six months of the year.
Dr. Chris: And that actually brings me – I actually saw you present one time at a conference – and it brings me to my next point. One thing that was mentioned was that if you’re north of Atlanta you wouldn’t be able to make sufficient vitamin D from the sun. If you could just clarify that a little bit, that would be great. If I’m on the mark with that or what.
Dr. Heaney: Well, it’s useful to bear in mind that the human organism evolved in equatorial east Africa wearing no clothing. We got sun exposure, tropical sun exposure, 365 days a year for all practical purposes over our whole body. And we don’t begin to approach that now. In the summer here at Omaha at 41 degr ees north, about the same as Boston as a matter of fact, we can make vitamin D. We can make substantial quantities, but it doesn’t last us through the year. By the time we get to February, even outdoor summer workers are now down to a level that I would consider deficient. So anybody living north of Atlanta certainly, even though they may get out in the sun substantially in the summer, really needs year round vitamin D supplementation. Now from Atlanta or Dallas, farther south, if you’re outdoors a lot then you may not need much vitamin D. But actually studies of middle aged and older women, particularly those with osteoporosis, have shown that the prevalence of vitamin D deficiency is low in any part of the country. Florida, Arizona, Texas, you name it. And that’s largely because the women concerned actually don’t spend much time outdoors. And when that’s the case, of course, it doesn’t make any difference at which latitude you may live, you need to get the ultraviolet rays in order to make the vitamin D. And if you’re not getting them, then you may as well live in Alaska as far as that’s concerned.
Dr. Chris: Great point. And that makes me think of something else... for people who do spend time outdoors, which unfortunately are not many, if people are putting sun block on or suntan lotion, does that affect vitamin D? Or are you still able to make it even with suntan lotion.
Dr. Heaney: Sunblock, to the extent that it’s applied according to the manufacturer’s directions, sunblock blocks vitamin D synthesis entirely. Just as it blocks the damage that those same UV rays might be producing in the skin.
Dr. Heaney: So you can’t really have it both ways. But it’s important to understand that sunblock came into widespread use just in the past 25 years. If the absence of sunblock had b een so deleterious to us, the human race might have died out thousands of years ago. But it didn’t. I mean my parents, my grandparents, your grandparents surely got a lot of sun exposure unprotected and I don’t know whether any of them died of skin cancer, but I can tell you I have no relatives that did. So I think the principal problem with excessive sun exposure is drying and wrinkling and other cosmetic problems. Now yes, you can get squamous cell carcinoma and basal cell carcinoma and I don’t think those are anything to be laughed at but they’re not as serious and life threatening as many of the problem diseases caused by vitamin D deficiency might be.
Dr. Chris: So would you recommend then people either not wear suntan lotion or at least get a little sun exposure on a daily basis without it?
Dr. Heaney: Well the good news is that much of the vitamin D we make in our skin is probably made in the first few minutes after sun exposure. The timing on this is still uncertain so I can’t put a precise time number in terms of how many minutes. But let’s just say for the sake of argument that if you’re going to be out in the sun, stay out there for 15 minutes and then put your sunblock on. That would probably protect you just as well from most of the damage that might be produced by ultraviolet, but at the same time it will allow you to get some and maybe much of the vitamin D you would otherwise have gotten. You see, the longer you’re out in the sun without sunblock protection, what the UV radiation does is not only make vitamin D in the skin, but it also degrades it before it can leave the skin. So you reach a point where there’s kind of a diminishing return there. And that’s why the first few minutes are probably where you’re going to get the best benefit with the least damage."
So, use sunscreen, but only after you've gotten used to the sun over time, over the course of several weeks. DO NOT let yourself get burned, soak up the rays so that your BODY can make vitamin D!
Vitamin D3 is best absorbed by the body, mostly in gelcap form. Use it, especially this winter...http://www.activeconcepttraining.com/apps/blog/show/2370276-you-gotta-read-this-hypertension-and-fructose-etc-
Dr. Davis of "Wheat Belly" fame also recommends vitamin D moreso than that of RDA recommendations.
It's where we come from as humans...get some supplements of Vitamin D. Please.
Categories: General Nutrition