Calorie Lab
August 12, 2011
A study conducted by the University of Michigan School of Public Health found that Colombian girls 5 to 12 years old with low vitamin D levels doubled their chance of having their first period, called menarche, during the 30 month follow up. Fifty-seven percent of deficient girls reached menarche around 11.8 years compared to 12.6 years in the sufficient group.










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