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Joslin research finds nearly three-quarters of youths with diabetes insufficient in vitamin D
Date:12/15/2008

BOSTON [Dec. 15, 2008] Three-quarters of youths with type 1 diabetes were found to have insufficient levels of vitamin D, according to a study by researchers at the Joslin Diabetes Center findings that suggest children with the disease may need vitamin D supplementation to prevent bone fragility later in life.

"To our surprise, we found extremely high rates of vitamin D inadequacy," said Lori Laffel, M.D., M.P.H., Chief of the Pediatric, Adolescent and Young Adult Section at Joslin, Investigator in the Section on Genetics and Epidemiology, and senior author of the paper. "We didn't expect to find that only 24 percent of the study population would have adequate levels."

The study, which appears in the January 2009 issue of The Journal of Pediatrics, measured levels of serum 25-hydroxyvitamin D in 128 youths with type 1 diabetes ranging in age from 1.5 to 17.5 years. The study sample included subjects with recent onset of diabetes as well as those who had long-established diabetes.

It found 24 percent had sufficient levels, 61 percent with insufficient levels and 15 percent to be deficient or having the lowest levels. Generally, those with deficient levels were the oldest of the subjects. In fact, 85 percent of the adolescents in the sample demonstrated inadequate vitamin D levels.

The paper notes that diabetes itself can negatively impact bone health and is associated with a modest reduction in bone mineral density and strength and an increase in fracture risk among those middle-aged and older. At the same time, vitamin D deficiency in infants and children is associated with bone deformation, while less severe vitamin D insufficiency prevents youths from attaining their optimal bone mass and may contribute to increased fracture risk later in life, the paper adds.

For these reasons, vitamin D deficiency or insufficiency poses an increased risk for children with diabetes, the paper says. In addition to reduced sun exposure, diminished milk intake, substituted by intake of sugar-free beverages among youth with diabetes, may account for inadequate vitamin D levels.

"In addition to inadequate levels of vitamin D, adolescent patients with type 1 diabetes potentially possess multiple risk factors for increased skeletal fragility," the paper notes.

The researchers were interested in looking at vitamin D levels because of the vitamin's presumed role in immune modulation and because it is thought to possibly play a role in the occurrence of type 1 diabetes.

In addition, there has been a rise in vitamin D deficiency among children in general, mostly among those living in northern climates where sun exposure is lowest, and also in association with the increased use of sun block, recommended in efforts to prevent skin cancer. Protection from over-exposure to sunlight through use of sunscreens remains an important public health initiative, Laffel stressed.

"We need to make sure all youths in general are getting enough vitamin D in their diets," commented Britta Svoren, M.D., the primary author of the paper and a member of Joslin's Pediatric, Adolescent and Young Adult Section and the Section on Genetics and Epidemiololgy. "And, we need to pay particular attention to those with diabetes as they appear to be at an even higher risk of vitamin D deficiency. For children who are not drinking sufficient amounts of vitamin D fortified milk, we are encouraging them to take a vitamin D supplement of 400 IU daily. Many cereals are fortified with vitamin D as well."


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Contact: Kira Jastive
kira.jastive@joslin.harvard.edu
617-732-2418
Joslin Diabetes Center
Source:Eurekalert

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