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Low vitamin D with high vitamin A associated with increased risk of osteoporosis – June 2010

Vitamin D deficiency and high serum levels of vitamin A increase the risk of osteoporosis evaluated by Quantitative Ultrasound Measurements (QUS) in postmenopausal Spanish women

Clinical Biochemistry doi:10.1016/j.clinbiochem.2010.06.001
Copyright © 2010 Published by Elsevier Inc.
J.M. Mata-Granadosa, b, R. Cuenca-Acevedob, M.D. Luque de Castroc, M. Sosad and J.M. Quesada-Gómeza, b, Corresponding Author Contact Information, E-mail The Corresponding Author
a Unit of Investigation, Development and Initiatives, Sanyres, Córdoba, Spain
b Mineral Metabolism Unit, Endocrinology Service, Hospital University Reina Sofía, Córdoba, Spain
c Departament of Analytical Chemistry, University of Córdoba, Córdoba, Spain
d University of Las Palmas de Gran Canaria Group of Investigation on Osteoporosis and Mineral Metabolism, Hospital University Insular, Bone Metabolic Unit, Gran Canaria, Canary Islands, Spain
Received 10 March 2010; Available online 17 June 2010.

Objectives Association between vitamin D deficiency and excess of vitamin A as a potential risk factor of osteoporosis and fracture has been evaluated.

Design and methods 232 healthy postmenopausal women were studied.
Serum parameters were analyzed by standard methods and fat-soluble vitamins by an own HPLC method. QUS measurement of the calcaneal bone was carried out by Sahara.

Results 124 patients were considered non-osteoporotic and 101 (44.9%) were osteoporotic.
The prevalence of high serum levels of retinol was 36.4% and vitamin D deficiency was 70.1%. 60.4% of women with vitamin D deficiency have high serum levels of retinol.

In the whole population, the increased risk of osteoporosis was up to three times higher for the highest retinol quintile, as compared with the lowest retinol quintile. Whereas in women with vitamin D deficiency the risk of osteoporosis increased was up 5 times higher than women in the lowest quintile of retinol.

Conclusions Our results show that high retinol levels together with vitamin D deficiency are hitherto an overlooked risk factor for osteoporosis.
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