Vitamin D Deficiency in Children and Adolescents: Role of Puberty and Obesity on Vitamin D Status.

3 - 5 Hence, in recent years there is an increasing trend in investigating the prevalence and long-term effects of vitamin D deficiency. 6 Vitamin D deficiency is common among children and adolescents and negatively affects bone density, muscle function, glucose metabolism and insulin sensitivity. 7 About 1 billion people in the world have low vitamin D levels; however, the prevalence of its deficiency is still uncertain worldwide. 1 Theoretically, vitamin D deficiency is not expected among people living in regions with intense sunlight.

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