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Too much of vitamin D may harm the heart

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By Stephen Lau
Thursday Jan 5, 2012 (foodconsumer.org) -- Researchers from Johns Hopkins University said that vitamin D would not benefit the heart or can even harm it if the serum level of this sunshine vitamin exceeds the normal level.
The study, conducted on more than 15,000 participants from 2001 to 2006, found an inverse association between vitamin D and c-reactive protein (CRP), which is a common marker for cardiovascular inflammation linked to stiffening of the blood vessels, and an increased risk of cardiovascular problems.
People with normal or close to normal vitamin D levels had healthier and lower levels of inflammation. But increasing vitamin D in the blood will boost an increase in CRP.
“The inflammation that was curtailed by vitamin D does not appear to be curtailed at higher levels of vitamin D,” says Muhammad Amer, M.D., leader of the study.
“Clearly vitamin D is important for your heart health, especially if you have low blood levels of vitamin D. It reduces cardiovascular inflammation and atherosclerosis, and may reduce mortality, but it appears that at some point it can be too much of a good thing.”
According to the paper, 100 international unit of vitamin D intaken daily produces about one nanogram per milliliter of 25-Hydroxy vitamin D levels in the blood, and the low end of the normal range for vitamin D is 21 nanograms per milliter.
Therefore, the scientists suggested both consumers and physicians be cautious about the intake of this vitamin D supplements.
“Those pills could have unforeseen consequences to health even if they are not technically toxic,” Amer added.
As reported early on foodconsumer.org, moderate intake of vitamin D may extend our lifespan, help children to fight against asthma, etc.  Vitamin D decificiency is associated with more than 100 health conditions including cancer, heart disease, diabetes and depression.

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