PubMed · 3578103
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A R Feinstein. 1987. Scientific standards and epidemiologic methods.. https://doi.org/10.1093/ajcn%2F45.5.1080
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Evidence from both physiological experiments and randomized trials demonstrates that elevating vitamin D status above levels prevailing in the North American and European adult populations improves calcium absorption and reduces fall risk and osteoporotic fractures. Additionally observational data suggest that raising vitamin D status protects against various cancers and autoimmune disorders as well. Hence a strong case can be made for immediate improvement in vitamin D status of the general population.