source: http://www.nutraingredients.com/Product-Categories/Vitamins-premixes/Vitamin-D-levels-not-enough-for-winter-Study
Current recommended intake for vitamin D during winter months and need to be at increased by five, says a new study from California.
Recommended intakes for people with darker skins should be increased to a whopping 2100 to 3100 International Units per day all year-round, up from the current adequate intakes set at 5 micrograms per day (200 International Units).
Researchers from University of California, Davis report their findings in the Journal of Nutrition. The study, led by Laura Hill, represents the latest in a long line of studies calling for increases in the recommended levels for vitamin D.
Concerns are growing over the health implications of living with insufficient and deficient vitamin D levels. A recent study from China reported that 94 per cent of people aged between 50 and 70 enrolled in the study were vitamin D deficient or insufficient, which may increase their risk of metabolic syndrome.
...While our bodies do manufacture vitamin D on exposure to sunshine, the levels in some northern countries are so weak during the winter months that our body makes no vitamin D at all, meaning that dietary supplements and fortified foods are seen by many as the best way to boost intakes of vitamin D.
Read rest of article here http://www.nutraingredients.com/Product-Categories/Vitamins-premixes/Vitamin-D-levels-not-enough-for-winter-Study
Source: Journal of Nutrition
Published online ahead of print, doi: 10.3945/jn.109.115253
"Vitamin D Intake Needed to Maintain Target Serum 25-Hydroxyvitamin D Concentrations in Participants with Low Sun Exposure and Dark Skin Pigmentation Is Substantially Higher Than Current Recommendations"
Authors: L.M. Hall, M.G. Kimlin, P.A. Aronov, B.D. Hammock, J.R. Slusser, L.R. Woodhouse, C.B. Stephensen
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