Vitamin D deficiency, or Hypovitaminosis D, can result from inadequate nutritional intake of vitamin D and/or inadequate sunlightexposure (in particular sunlight with adequate ultraviolet B rays), disorders limiting vitamin D absorption, and conditions impairing vitamin D conversion into active metabolites—including certain liver, kidney, and hereditary disorders. Deficiency impairs bone mineralization, leading to bone softening diseases as rickets in children and osteomalacia and osteoporosis in adults. Emerging evidence suggests vitamin D plays a role in the pathogenesis of non-alcoholic fatty liver disease
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http://www.aafp.org/afp/2009/1015/p841.html recognition and management of vitamin d deficiency paula bordelon, do; maria v. ghetu, md; and robert langan, md, st. luke's family medicine residency program, bethlehem, pennsylvania am fam physician. 2009 oct 15;80(8):841-846.
http://www.nutritotal.com.br/diretrizes/files/220--guidelinevitamind.pdf evaluation, treatment, and prevention of vitamin d deficiency: an endocrine society clinical practice guideline by michael f. holick, neil c. binkley, heike a. bischoff-ferrari, catherine m. gordon, david a. hanley, robert p. heaney, m. hassan murad,and connie m. weaver j clin endocrinol metab, july 2011, 96(7):0000 – 0000 doi: 10.1210/jc.2011-0385
http://annals.org/article.aspx?articleid=1938934 screening for vitamin d deficiency: a systematic review for the u.s. preventive services task force by erin s. leblanc, md, mph et al., ann intern med. 2015;162(2):109-122. doi:10.7326/m14-1659
http://www.nature.com/ejcn/journal/v70/n3/full/ejcn2015176a.htmleuropean journal of clinical nutrition (2016) 70, 373–379; doi:10.1038/ejcn.2015.176; published online 28 october 2015 prevalence of vitamin d deficiency and its association with nutrition, travelling and clothing habits in an immigrant population in northern sweden by l granlund et al.,