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nightsurfer on 2009-09-22Low serum 25-hydroxyvitamin D concentrations and secondary hyperparathyroidism in middle-aged white strict vegetarians.
Lamberg-Allardt C, Kärkkäinen M, Seppänen R, Biström H.
Am J Clin Nutr. 1993 Nov;58(5):684-9.
In conclusion, white strict vegetarians are at risk of vitamin D deficiency, at least in the winter, primarily because of a low dietary vitamin D intake, despite a normal sunlight exposure in summer. Low serum 25(OH)D concentrations are accompanied by high S-iPTH concentrations, which also are affected by a low calcium intake. The effect of these changes on bone health remains to be evaluated.