Special Report, Americas, Opinion

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The studies they examined showed that taking vitamin D might reduce the number of falls among the elderly. And combining the supplement with calcium did show a reduction in fractures. Still, the benefit was not overwhelming. Michael Allan, director of Evidence Based Medicine at the University of Alberta's Faculty of Medicine & Dentistry in a press release. The review also looked at the belief that taking high doses of vitamin D was a good thing - or at least it couldn't hurt. But the evidence showed the opposite - massive doses of vitamin D (at least 300,000 international units or IUs once a year) actually increased the risk of falls and fractures. The typical vitamin D dose is 600 IUs per day, which works out to 219,000 IUs per year. Finally, the authors challenged the very notion of vitamin D testing itself. The most common test given to check for vitamin D levels is a blood test called 25-(OH)D. But the researchers did not recommend it because they said the assays (test of the components) can vary by as much as 10-20 percent even when repeating the test in the same person at the same time. Also, the cutoff points for vitamin D deficiency used by labs are neither standardized nor based on rigorous scientific studies. So the number of people supposedly vitamin D-deficient may be overestimated. Vitamin D is found naturally in only a few foods (like cod liver oil, fatty fish and egg yolks), and the human body produces it after exposure to sunlight. Lack of vitamin D is known to cause the bone disease rickets in children and osteomalacia (or softening of the bones) in adults, according to the Centers for Disease Control and Prevention. The National Institutes of Health says 600 IUs of vitamin D is all you need each day (800 IUs if you are over 70). One egg yolk has about 40 IUs while a cup of canned tuna has 238 IUs. A tablespoon of cod liver oil has 1350 IUs.




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