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Prevalence of vitamin D insufficiency in Brazilian adolescents. Peters BS, dos Santos LC, Fisberg M, Wood RJ, Martini LA. Ann Nutr Metab. 2009;54(1):15-21. Epub 2009 Feb 5. PMID: 19194104 DOI: 10.1159/000199454 CONCLUSIONS: The present study suggests that even in a sunny climate like Brazil the prevalence of vitamin D insufficiency in adolescents is high. Most likely this is due to low intakes of vitamin D in this group. Due to the limited extent of natural dietary sources of vitamin D, a policy of vitamin D food fortification should be considered in the future, and in the meantime greater use of vitamin D supplements in this population group should be encouraged to provide the increased amounts of this essential nutrient for optimal health.

Part 3 - Idea from Brazil: Serve a side of rice and beans All that shaking at Carnaval isn't the only body-friendly routine in Rio; Brazilians remain slender by savouring this time-honored dish... Ebook offer: www.nuin90.com/ebook_offer/12spb321ly.html

Is a lower dose of vitamin D supplementation enough to increase 25(OH)D status in a sunny country? Pignotti GA, Genaro PS, Pinheiro MM, Szejnfeld VL, Martini LA. Eur J Nutr. 2009 Nov 28. [Epub ahead of print] PMID: 19946776 CONCLUSION: The dose given (400 IU/day) was not enough to achieve 25(OH)D concentration, considered optimal for bone health.