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Objective To study vitamin D status and bone metabolism of premenopausal vegetarians and omnivores during a 1-year period.Design Longitudinal, observational study. Bone mineral density was measured, blood samples from fasting subjects were obtained, and 24-hour urinary samples were collected in February 1994, August 1994, and January 1995. Serum 25-hydroxyvitamin D [S-25(OH)D] and intact parathyroid...