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Curr Nutr Food Sci. Author manuscript; available in PMC 2016 January 01. Published in final edited form as: Curr Nutr Food Sci. 2015 ; 11(2): 124–130. doi:10.2174/1573401311999150427164144.

Determinants of 25-Hydroxyvitamin D Concentrations in Infants and Toddlers Hilary Michel, MD1, Flora Olabopo, BS1, Li Wang, MS2, Anita Nucci, PhD, RD, LDN3, Susan L Greenspan, MD4, and Kumaravel Rajakumar, MD, MS1 1Department

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2Clinical

of Pediatrics, University of Pittsburgh, Pittsburgh, PA, United States

and Translational Science Institute, University of Pittsburgh, Pittsburgh, PA, United

States 3Department

of Nutrition, Georgia State University, Atlanta, GA, United States

4Department

of Medicine, University of Pittsburgh, Pittsburgh, PA, United States

Abstract Background—Resurgence of rickets and recognition of excessive prevalence of hypovitaminosis D among all age groups in the western hemisphere have refocused attention on vitamin D nutrition.

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Objective—To examine the prevalence of hypovitaminosis D [25-hydroxyvitamin D [25(OH)D]