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DRI Dietary Reference Intakes Calcium Vitamin D
FIGURE 7-5 Estimated total vitamin D intakes in the United States from food and supplements, by intake percentile groups, age, and gender.
NOTE: F = female; IU = International Units; M = male; y = years.
SOURCE: NHANES 2005–2006 as analyzed by Bailey et al. (2010). Data used to create figure can be found in Appendix H.
persons may be experiencing intakes below the reference values, but are exhibiting serum 25OHD levels above 40 nmol/L. In fact, all are above the 50 nmol/L concentration, the level associated with the RDA. There is an additional factor to consider in this comparison, in that the NHANES data are generally collected during the summer months in the northern regions of the United States and in the winter months in the southern regions; this introduces the variable of sun exposure into the comparison in that it decreases the likelihood that individuals surveyed will be experiencing low levels of sun exposure. As an informal conceptual check, it is
health as manifested by, depending upon age, rates of bone accretion, bone mineral density, and fractures.