title: Vitamin D intakes in North America and Asia-Pacific countries are not sufficient to prevent vitamin D insufficiency.
abstract: Worldwide, vitamin D status is suboptimal relative to circulating levels of 25-hydroxyvitamin D (25OHD) needed to prevent a variety of chronic conditions, however, it has long been assumed that dietary intake is sufficient to meet needs when sun exposure is limited. In the USA, mean vitamin D intake from foods is close to 5 microg, the Dietary Reference Intake (DRI) recommendation for persons up to 50 years; however, the amount of vitamin D needed to maintain a sufficient 25OHD level during winter is >12.5 microg, and that needed for darkly pigmented, veiled, or sun protected persons is >50 microg. In the USA, most vitamin D intake from foods is provided by fortification. Canada and New Zealand have fewer fortified choices, and intakes are correspondingly lower. Supplement use can increase mean intake to >12.5 microg but does not always reach those who need it most. Serum 25OHD levels in New Zealand reveal much more insufficiency than expected, especially for Pacific people and Mäori; low serum 25OHD concentrations are seen throughout the Asia-Pacific region. Fortification and supplementation may be effective to achieve intakes of 12.5 microg vitamin D in some of the population, but for many achieving the amount needed in the absence of skin synthesis requires intakes above the current upper level for vitamin D of 50 microg.
authors.affiliation: College of Pharmacy and Nutrition, University of Saskatchewan, 110 Science Place, Saskatoon, SK, Canada S7N 5C9. susan.whiting@usask.ca
authors.forename: Susan J
authors.initials: SJ
authors.lastname: Whiting
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Green
authors.forename: Mona S
authors.initials: MS
authors.lastname: Calvo
mesh_terms: D001208:Asia / Q000453:epidemiology; D004032:Diet; D005260:Female; D006801:Humans; D008297:Male; D009656:North America / Q000453:epidemiology; D010139:Pacific Islands / Q000453:epidemiology; D014807:Vitamin D / Q000627:therapeutic use*; D014808:Vitamin D Deficiency / Q000097:blood / Q000188:drug therapy* / Q000453:epidemiology
chemical_list: D014807:Vitamin D