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Published in: Osteoporosis International 1/2017

01-01-2017 | Original Article

Three doses of vitamin D, bone mineral density, and geometry in older women during modest weight control in a 1-year randomized controlled trial

Authors: L. C. Pop, D. Sukumar, S. H. Schneider, Y. Schlussel, T. Stahl, C. Gordon, X. Wang, T. V. Papathomas, S. A. Shapses

Published in: Osteoporosis International | Issue 1/2017

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Abstract

Summary

The effects of higher than recommended vitamin D doses on bone mineral density (BMD) and quality are not known. In this study, higher intakes, in postmenopausal women undergoing weight control over 1 year, had no effect on areal or volumetric BMD but prevented the deterioration in cortical bone geometry.

Introduction

Studies examining how bone responds to a standard dose of vitamin D supplementation have been inconsistent. In addition, the effects of higher doses on BMD and quality are not known. Postmenopausal women undergoing weight control to improve health outcomes are particularly at risk for bone loss and might benefit from supplemental vitamin D intake above the recommended allowance.

Methods

This 1-year-long, randomized, double-blind controlled study addresses whether vitamin D supplementation, in healthy overweight/obese older women, affects BMD and bone structural parameters. In addition, bone turnover and serum total, free, and bioavailable 25-hydroxyvitamin D (25OHD) responses to one of three daily levels of vitamin D3 (600, 2000, 4000 IU) with 1.2 Ca g/day during weight control were examined.

Results

Fifty-eight women (age, 58 ± 6 years; body mass index, 30.2 ± 3.8 kg/m2, serum 25OHD, 27.3 ± 4.4 ng/mL) were randomized to treatment. After 1 year, serum 25OHD concentrations increased to 26.5 ± 4.4, 35.9 ± 4.5, and 41.5 ± 6.9 ng/mL, in groups 600, 2000, and 4000 IU, respectively, and differed between groups (p < 0.01). Weight change was similar between groups (−3.0 ± 4.1 %). Cortical (Ct) thickness of the tibia changed by −1.5 ± 5.1 %, +0.6 ± 3.2 %, and +2.0 ± 4.5 % in groups 600, 2000, and 4000 IU, respectively, and each group was significantly different from each other (p < 0.05).

Conclusion

The decline in Ct thickness was prevented with higher vitamin D3 supplementation, but there were no other significant changes due to treatment over 1 year. Whether these findings translate to changes in biomechanical properties leading to reduced fracture risk should be addressed in future studies.
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Metadata
Title
Three doses of vitamin D, bone mineral density, and geometry in older women during modest weight control in a 1-year randomized controlled trial
Authors
L. C. Pop
D. Sukumar
S. H. Schneider
Y. Schlussel
T. Stahl
C. Gordon
X. Wang
T. V. Papathomas
S. A. Shapses
Publication date
01-01-2017
Publisher
Springer London
Published in
Osteoporosis International / Issue 1/2017
Print ISSN: 0937-941X
Electronic ISSN: 1433-2965
DOI
https://doi.org/10.1007/s00198-016-3735-z

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