About 70 percent of U.S. children have low levels of vitamin D, which puts them at higher risk for bone and heart disease according to new research.
"We expected the prevalence of vitamin D deficiency would be high, but the magnitude of the problem nationwide was shocking," said Dr. Juhi Kumar of Children's Hospital at Montefiore Medical Center. Here's the link to the article where you'll also find some video footage from CBS.
Essential substances that cannot be produced by the body and so must be acquired from the diet.
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