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Strategies to improve vitamin D status in northern European children: exploring the merits of vitamin D fortification and supplementation. Tylavsky FA, Cheng S, Lyytikäinen A, Viljakainen H, Lamberg-Allardt C. J Nutr. 2006 Apr;136(4):1130-4. PMID: 16549494

Vitamin D status and the risk of lung cancer: a cohort study in Finland. Kilkkinen A, Knekt P, Heliövaara M, Rissanen H, Marniemi J, Hakulinen T, Aromaa A. Cancer Epidemiol Biomarkers Prev. 2008 Nov;17(11):3274-8. PMID: 18990771v In conclusion, although there was no overall association between vitamin D and lung cancer risk, women and young participants with a higher level of vitamin D were observed to have a lower lung cancer risk. Although experimental data support the suppressing effect of vitamin D on the development of lung cancer, large epidemiologic studies from different populations with repeated measurements of vitamin D are warranted to confirm this finding. (Cancer Epidemiol Biomarkers Prev 2008;17(11):3274-8)

Estimates of optimal vitamin D status. Dawson-Hughes B, Heaney RP, Holick MF, Lips P, Meunier PJ, Vieth R. Osteoporos Int. 2005 Jul;16(7):713-6. Epub 2005 Mar 18. PMID: 15776217

An estimated 50% to 60% of older people have suboptimal vitamin D levels, which is a problem that could affect more than bone health. Recent cross-sectional studies have also shown an association between low vitamin D levels and cardiovascular disease, hypertension, and metabolic syndrome. In a long-term prospective study from Germany, researchers assessed whether 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D levels were associated with all-cause and cardiovascular mortality among more than 3000 consecutive patients (mean age, 62) referred for coronary angiography.

Heaney RP. Functional indices of vitamin D status and ramifications of vitamin D deficiency.Am J Clin Nutr. 2004 Dec;80(6 Suppl):1706S-9S. Review.PMID: 15585791 [PubMed - indexed for MEDLINE]

Geographical differences in vitamin D status, with particular reference to European countries Lars Ovesen*, Rikke Andersen and Jette Jakobsen Institute of Food Safety and Nutrition, The Danish Veterinary and Food Administration, 30A Sydmarken, 2860 S

African Americans, 25-hydroxyvitamin D, and osteoporosis: a paradox. Aloia JF. Am J Clin Nutr. 2008 Aug;88(2):545S-550S. Review. PMID: 18689399