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Calcified Tissue International

, Volume 93, Issue 1, pp 69–77 | Cite as

The Effect of High-Dose Vitamin D Supplementation on Calciotropic Hormones and Bone Mineral Density in Obese Subjects with Low Levels of Circulating 25-Hydroxyvitamin D: Results from a Randomized Controlled Study

  • Louise WambergEmail author
  • Steen B. Pedersen
  • Bjørn Richelsen
  • Lars Rejnmark
Original Research

Abstract

Low levels of 25-hydroxyvitamin D (25OHD) are associated with increased bone turnover and risk of fractures. Plasma 25OHD is inversely related to body mass index, and vitamin D deficiency is common in obesity. We aimed to determine whether vitamin D supplementation affects bone turnover and bone mineral density (BMD) in obese subjects. Fifty-two healthy obese men and women aged 18–50 years with plasma 25OHD levels below 50 nmol/L were randomized to 7,000 IU of cholecalciferol daily or placebo for 26 weeks. We measured plasma levels of 25OHD, parathyroid hormone (PTH), and markers of bone turnover, as well as BMD at the hip, spine, forearm, and whole body. Compared with placebo, treatment with cholecalciferol increased mean plasma 25OHD from 35 to 110 nmol/L (p < 0.00001) and significantly decreased PTH (p < 0.05). BMD increased significantly at the forearm by 1.6 ± 0.7 % (p = 0.03). The bone resorption marker C-terminal telopetide of type 1 collagen (CTX) decreased borderline significantly in the cholecalciferol group compared with the placebo group (p = 0.07). Changes in plasma 25OHD correlated inversely with changes in plasma levels of bone-specific alkaline phosphatase (r = −0.38, p = 0.01) and CTX (r = −0.33, p = 0.03). Changes in CTX correlated inversely with changes in spine BMD (r = −0.45, p = 0.04). Increasing circulating 25OHD levels by cholecalciferol treatment is of importance to bone health in young obese subjects as increased levels of 25OHD are associated with a decrease in both PTH and bone turnover and with an increase in BMD at the forearm.

Keywords

Obesity Vitamin D Parathyroid hormone Bone turnover Bone mineral density Randomized controlled trial 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Louise Wamberg
    • 1
    • 2
    Email author
  • Steen B. Pedersen
    • 1
    • 2
  • Bjørn Richelsen
    • 1
    • 2
  • Lars Rejnmark
    • 1
    • 2
  1. 1.Department of Endocrinology and Internal Medicine MEAAarhus University HospitalAarhusDenmark
  2. 2.Institute of Clinical Medicine, Aarhus UniversityAarhusDenmark

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