The journal Pediatrics published two prospective cohort studies evaluating the effects of vitamin D deficiency in pediatric patients admitted to pediatric intensive care units (PICUs). Researchers tested vitamin D levels in 511 patients admitted to Boston Children Hospital and 326 pediatric patients admitted to hospitals in Canada. The study found that vitamin D deficiency was common in this population and lower vitamin D levels were associated with longer hospital stay.  How do you counsel adult and pediatric patients about vitamin D?

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