Vitamin D insufficiency together with high serum levels of vitamin A increases the risk for osteoporosis in postmenopausal women

Arch Osteoporos. 2013;8:124. doi: 10.1007/s11657-013-0124-5. Epub 2013 Feb 16.

Abstract

Postmenopausal women who were vitamin D deficient and had high serum levels of retinol had an eight times higher risk of having osteoporosis. A high retinol level together with vitamin D deficiency/insufficiency is an additional risk factor for osteoporosis.

Purpose: The aim of this study was to evaluate the association between vitamin D deficiency/insufficiency and excess of vitamin A intake as an osteoporosis risk factor in healthy postmenopausal women

Design: The design is a cross-sectional study of 232 healthy postmenopausal women.

Methods: Bone mass was evaluated by dual energy X-ray absorptiometry. Serum calcium, albumin phosphorus, creatinine, total high-density lipoprotein (HDL) and low-density lipoprotein (LDL) cholesterol, and triglycerides analyzed by standard methods and retinol and 25-hydroxyvitamin D [25(OH)D] measured by an online solid-phase extraction coupled with high-pressure liquid chromatography-ultraviolet detection.

Results: Prevalence of vitamin D deficiency [25(OH)D < 20 ng/mL] was 70.1 %; 14.3 % had a 25(OH)D < 10 ng/mL, and 23.6 % had insufficiency [25(OH)D 21-29 ng/mL]. Prevalence of high serum levels of retinol (>80 μg/dL) was 36.4 %. Among subjects with 25(OH)D <20 ng/mL (n = 152), 60.4 % (n = 92) had serum levels of retinol > 80 μg/dL. Bone density measurements revealed that the risk of osteoporosis was ~8 times higher in women with the highest retinol levels, as compared with women with the lowest retinol levels. In women with 25(OH)D < 20 ng/mL, the risk for osteoporosis increased substantially in women who had the highest blood levels of retinol compared to the women with lowest retinol levels.

Conclusions: Higher retinol levels together with vitamin D deficiency could be a significant additional risk factor for osteoporosis, underscoring the need for improved physician and public education regarding optimization of vitamin D status in postmenopausal women and developing policies to avoid high serum levels of vitamin A.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Absorptiometry, Photon
  • Bone Density
  • Cross-Sectional Studies
  • Female
  • Humans
  • Middle Aged
  • Osteoporosis, Postmenopausal / blood
  • Osteoporosis, Postmenopausal / epidemiology*
  • Postmenopause / blood*
  • Risk Factors
  • Spain / epidemiology
  • Vitamin A / blood*
  • Vitamin D Deficiency / blood
  • Vitamin D Deficiency / epidemiology*

Substances

  • Vitamin A