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TOPIC: Exerpt of another Interview with Dr. Holick & Vitami

Exerpt of another Interview with Dr. Holick & Vitami 14 Oct 2005 19:57 #4117

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[b:aa978d9803]Dr Micheal Holick[/b:aa978d9803] was one of the scientists on the National Academy committee that set limits and recommendations for vitamin D. The following is an excerpt from another interview from the [i:aa978d9803]Center for Science in the Public Interest.[/i:aa978d9803]

[b:aa978d9803]Q Why did the National Academy say that people shouldn't exceed 2,000 IU a day?[/b:aa978d9803]

[b:aa978d9803]A [/b:aa978d9803]Our committee recommended an upper safe limit of 2,000 IU because we had to rely only on published studies. Other studies suggest that at least 5,000 IU and maybe 10,000 IU a day is safe. It's virtually impossible to get that much from diet and supplements. And there's never been a reported case of vitamin D toxicity because of too much sun. Nature has cleverly programmed into the system that any excess from the sun is destroyed.

[b:aa978d9803]Q [/b:aa978d9803][b:aa978d9803]Should people get their vitamin D levels checked?[/b:aa978d9803]

[b:aa978d9803]A Yes[/b:aa978d9803], just like you get your cholesterol checked at least once a year. The best time is around November, because if you're deficient then, you'll be severely deficient at the end of winter. And make sure that your doctor orders a test for 25-hydroxy-vitamin D, not 1,25-dihydroxyvitamin D. As you become deficient, the body tries to compensate by increasing the kidneys' production of 1,25-dihydroxyvitamin D. So those levels are normal or even elevated. In 50 percent of all assays done worldwide, doctors order a 1,25-hydroxy-vitamin D assay. I don't have a clue what they do with that information.

[b:aa978d9803]Q They may misinterpret it?[/b:aa978d9803]

[b:aa978d9803]A Yes.[/b:aa978d9803] It comes back normal or high, so they think the patient has more than enough vitamin D, when it's really a sign that the patient is becoming deficient.

[b:aa978d9803]Q What level is deficient?[/b:aa978d9803]

[b:aa978d9803]A[/b:aa978d9803] A 25-hydroxyvitamin D below 20 nanograms per milliliter. From 20-30 is boarderline adequate. A healthy level is betweeen 30 and 50.

[b:aa978d9803]Q Do you recommend taking a supplement?[/b:aa978d9803]

[b:aa978d9803]A Yes.[/b:aa978d9803] If you get enough sun in the summer and fall, it will carry you through the winter, because you store vitamin D in your body fat. But most people don't get enough.
To give you an example, my mother recently went into a nursing home. While she lived at home, I made sure she wasn't deficient by prescribing 50,000 IU of vitamin D twice a month. I urged her primary care doctor to make sure she didn't become deficient. He finally tested her blood level and she was severely deficient. He's now treating her, as I would , with 50,000 IU of vitamin D once a week for eight weeks, followed by 50,000 IU twice a month.
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