 The following is part seven of an eight-part interview with Dr. Michael Holick, author of "The UV advantage" and one of the world's most respected authorities on vitamin D and the health benefits of natural sunlight. His work can be found at www.UVadvantage.com. Be sure to print out the vitamin D myths, facts and statistics page summarizing the key points of this interview.
Adams: In your book you talk about the link with calcium and calcium assimilation. How important is that for people to understand?
Dr. Holick: Well, it's critically important for people to realize that even if they have an adequate amount of vitamin D, if they don't have any calcium around, the vitamin D can't have the desired effect on bone health without being able to get enough calcium out of the diet and to put it into the bloodstream which will eventually get to your bones. So, making sure that you have adequate calcium intake is very important. And the recommendation by the Institute of Medicine (and I was on this committee back in 1997) is that if you're a teenager, 1300mg a day of calcium, for adults ages 18-50 it's 1000mg of calcium and 51+ years it's 1200mgs of calcium for both men and women.
Adams: And you mention that you have to have calcium in your system for vitamin D to work - is the opposite also true? You've got to have vitamin D for the calcium to be effective?
Dr. Holick: Oh, no question about it. If you are deficient in vitamin D, you absorb on average 10-15% of the calcium that's in your diet. If you’re sufficient in vitamin D, if you have adequate sun exposure or adequate intake of vitamin D, you absorb about 30% of the calcium in your diet. During pregnancy and lactation, and during growth spurts, the body responds appropriately by actually increasing that efficiency up to 80%.
Adams: So the normal level is 30%.
Dr. Holick: 30% for healthy adults, yes.
Adams: So a person who's taking, let's say coral calcium supplements, if they're not getting sunshine or vitamin D to go with it, their absorption is halved.
Dr. Holick: Yeah, exactly, and it's really of little benefit.
Adams: That's fascinating. Once again showing that there's no single magic pill, you have to be healthy across the board.
Dr. Holick: That's right. And what I typically recommend to my patients is Tums or Os-Cal or Caltrate or any of the respected brands ... Super Cal or all good sources of calcium.
Adams: As long as you've got vitamin D.
Dr. Holick: Correct. If you have adequate vitamin D or some sun exposure.
Adams: Cod liver oil is of course a great source of vitamin D, as you mention, but some people are concerned about contamination of these oily fish with heavy metals - is that a concern?
Dr. Holick: Yes, PCBs. And so, what you have to do is if you're going to buy it, buy it from a respectable source. Certainly it's a step in the right direction. But you know there are omega fatty acids in there that have benefits to the heart, and have other health benefits. So it may be that many of those outweigh the possible risk if there are contaminants in there. Although, like I said, a lot of the manufacturers are pretty good at making sure that there aren't.
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About the author: Mike Adams is a holistic nutritionist with a passion for teaching people how to improve their health He is a prolific writer and has published thousands of articles, interviews, reports and consumer guides, impacting the lives of millions of readers around the world who are experiencing phenomenal health benefits from reading his articles. Adams is a trusted, independent journalist who receives no money or promotional fees whatsoever to write about other companies' products. In 2007, Adams launched EcoLEDs, a maker of energy efficient LED lights that greatly reduce CO2 emissions. He's also the CEO of a highly successful email newsletter software company that develops software used to send permission email campaigns to subscribers. Adams also serves as the executive director of the Consumer Wellness Center, a non-profit consumer protection group, and practices nature photography, Capoeira, Pilates and organic gardening. He's also author of numerous health books published by Truth Publishing and is the creator of several consumer-oriented grassroots campaigns, including the Spam. Don't Buy It! campaign, and the free downloadable Honest Food Guide. He also created the free reference sites HerbReference.com and HealingFoodReference.com. Adams believes in free speech, free access to nutritional supplements and the ending of corporate control over medicines, genes and seeds. Known by his callsign, the 'Health Ranger,' Adams posts his missions statements, health statistics and health photos at www.HealthRanger.org
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