Many adolescents living in American...

Many adolescents living in American cities have reasonable levels of vitamin D, which is crucial for calcium absorption and bone growth

Researchers plant that 24 percent are 'severely deficient" and 42 percent are "vitamin D insufficient."

Vitamin D deficiency "is highest in African-American teenagers and during winter, although the puzzle seems to be common across sex season and ethnicity," wrote the application of mind authors.

The research appears in the June 2004 issue of the Archives of Pediatrics & Adolescent Medicine.

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