Black teens may require much more vitamin D for healthy intake than previously thought, according to a study published online last week at the Journal of Endocrinology & Metabolism.
Black teens may require much more vitamin D for healthy intake than previously thought, according to a study published online last week at the Journal of Endocrinology & Metabolism.
Researchers administered 400 or 2000 IU of vitamin D to 49 black teens (male and female) daily for 16 weeks. A primary aim of the study was to determine if vitamin D intake influences arterial stiffness, so arterial stiffness was measured using carotid femoral pulse wave velocity (PWV), a common way of achieving this measurement.
The higher intake of vitamin D resulted in higher vitamin D levels in patients at weeks 8 and 16. Furthermore, at the completion of the trial, researchers determined that 400 IU of vitamin D resulted in an increase of PWV from baseline to post-test (from 5.38 to 5.71 meters per second). However, the higher dose of vitamin D resulted in a decrease in PWV (from 5.41 to 5.33 meters per second).
'Daily 2000 IU vitamin D supplementation may be effective in optimizing vitamin D status and counteracting the progression of aortic stiffness in black youth,'ÃÂ wrote the study author.
The average age of the patients was 16 years, yet the current "adequate intake" of vitamin D for this age, according to the National Institutes of Health...s Office of Dietary Supplements, is 200 IU.
To read the study abstract, click here.
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