A must read news article for all of you following the vitamin D debate.
Amy Maxmen, The vitamin D-lemma. Nature 2011;475:23-25.
Some extracts to wet you appetite:
- A vociferous debate about vitamin-D supplementation reveals the difficulty of distilling strong advice from weak evidence.
- Much is at stake. By 2009, the amount spent on vitamin-D supplements in the United States had risen tenfold in ten years.
- “The Institute of Medicine (IOM) was too definitive in its recommendations,” says Michael Holick, an endocrinologist at Boston University School of Medicine in Massachusetts, and an outspoken critic of the IOM panel’s conclusions.
- Some physicians recommend supplementation of up to 6,000 international units (IU) a day to make up for the time that people spend indoors. This is less than the amount a fair-skinned person without sunblock might make in half an hour of exposure to the midday summer Sun.
- The Endocrine Society’s guidelines, call people with levels under 50 nmol/L “vitamin-D deficient”, and those with levels between 50 nmol/L and 72.5 nmol/L “insufficient”. The society’s guidelines also offer an ‘ideal’ level of 100–150 nmol/L for non-skeletal health benefits.
- Reinhold Vieth, a vitamin-D researcher at the University of Toronto in Canada, calls this demand for huge trials “a cop-out”. He says that there is good evidence that higher levels of vitamin D would reduce rates of multiple sclerosis, but a clinical trial to test this would require thousands of people and 30 years. “Saying we need perfect, placebo-controlled trials is denying the plausible evidence we have,” Veith says. “At what point do you offer advice?”
“I and others have already put our heads above the parapet to offer advice on vitamin D supplementation.”
“The debate regarding the IOM report and what level of supplementation is appropriate has definitely muddied the waters.”
“The IOM report is not that relevant to MS as the report was about bone health and not the immune effects of vitamin D.”
“My approach to the ideal vitamin D level is is based on advice of the experts who started the Vitamin D Council and evolutionary theory.”
“Man as a species evolved as hunter-gatherers and as a result our ancestors spent much of their time outdoors. All studies to date looking at people who simulate the hunter-gather lifestyle in terms of outdoor sun exposure have levels of vitamin D well above 100 nmol/L in their blood.”
“If you live in the UK (a country with poor quality sunlight) to get your levels above 100 nmol/L you need to take at 5000IU of vitamin D3 per day.”
“On a personal note when my family an I started taking vitamin D supplements about 4 years ago we started on 2000IU per day. Despite this I was still deficient at the end of last winter. This is why I have now increased our level of supplementation to 5000U per day, which is in line with the Vitamin D Council’s recommendations.”
Other posts on this blog you may find helpful:
05 Jul 2011
Vitamin D – some facts. Vitamin D is a misnomer; it was incorrectly classified as a vitamin. Vitamins: are nutrients that are required in tiny amounts; cannot be synthesised in sufficient quantities by our bodies …
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