Directly measured free 25-hydroxy vitamin D levels show no evidence of vitamin D deficiency in young Swedish women with anorexia nervosa

Abstract

Purpose

Anorexia nervosa (AN) is an eating disorder characterized by low fat mass complicated by osteoporosis. The role of circulating vitamin D in the development of bone loss in AN is unclear. Fat mass is known to be inversely associated with vitamin D levels measured as serum levels of total, protein-bound 25-hydroxyvitamin D, but the importance of directly measured, free levels of 25(OH)D has not been determined in AN. The aim of this study was to investigate vitamin D status, as assessed by serum concentrations of total and free serum 25(OH)D in patients with AN and healthy controls.

Methods

In female AN patients (n = 20), and healthy female controls (n = 78), total 25(OH)D was measured by LC–MS/MS, and free 25(OH)D with ELISA. In patients with AN bone mineral density (BMD) was determined with DEXA.

Results

There were no differences between patients and controls in total or free S-25(OH)D levels (80 ± 31 vs 72 ± 18 nmol/L, and 6.5 ± 2.5 vs 5.6 ± 1.8 pg/ml, respectively), and no association to BMD was found. In the entire group of patients and controls, both vitamin D parameters correlated with BMI, leptin, and PTH.

Conclusions

The current study did not demonstrate a vitamin D deficiency in patients with AN and our data does not support vitamin D deficiency as a contributing factor to bone loss in AN. Instead, we observed a trend toward higher vitamin D levels in AN subjects compared to controls. Measurement of free vitamin D levels did not contribute to additional information.

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Acknowledgments

This work was supported by a grant from the Medical Research Council of Southeast Sweden (FORSS).We are also indebted to nurse Susanne Petersen and biomedical scientist Siv-Pingh Von, for their excellent assistance.

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Correspondence to Pär Wanby.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the Regional Ethical Committee, Linköping, Sweden.

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Informed consent was obtained from all individual participants included in the study.

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Carlsson, M., Brudin, L. & Wanby, P. Directly measured free 25-hydroxy vitamin D levels show no evidence of vitamin D deficiency in young Swedish women with anorexia nervosa. Eat Weight Disord 23, 247–254 (2018). https://doi.org/10.1007/s40519-017-0392-y

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Keywords

  • Osteoporosis
  • Vitamin D
  • Adipose tissue
  • Anorexia nervosa
  • Leptin
  • Parathyroid hormone