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Cod liver oil consumption at different periods of life and bone mineral density in old age

  • Tinna Eysteinsdottir (a1), Thorhallur I. Halldorsson (a1) (a2), Inga Thorsdottir (a1) (a2), Gunnar Sigurdsson (a3) (a4), Sigurdur Sigurdsson (a3), Tamara Harris (a5), Lenore J. Launer (a5), Vilmundur Gudnason (a3) (a4), Ingibjorg Gunnarsdottir (a1) (a2) and Laufey Steingrimsdottir (a1) (a2)...

Abstract

Cod liver oil is a traditional source of vitamin D in Iceland, and regular intake is recommended partly for the sake of bone health. However, the association between lifelong consumption of cod liver oil and bone mineral density (BMD) in old age is unclear. The present study attempted to assess the associations between intake of cod liver oil in adolescence, midlife, and old age, and hip BMD in old age, as well as associations between cod liver oil intake in old age and serum 25-hydroxyvitamin D (25(OH)D) concentration. Participants of the Age, Gene/Environment Susceptibility–Reykjavik Study (age 66–96 years; n 4798), reported retrospectively cod liver oil intake during adolescence and midlife, as well as the one now in old age, using a validated FFQ. BMD of femoral neck and trochanteric region was measured by volumetric quantitative computed tomography, and serum 25(OH)D concentration was measured by means of a direct, competitive chemiluminescence immunoassay. Associations were assessed using linear regression models. No significant association was seen between retrospective cod liver oil intake and hip BMD in old age. Current intake of aged men was also not associated with hip BMD, while aged women with daily intakes had z-scores on average 0·1 higher, compared with those with an intake of < once/week. Although significant, this difference is small, and its clinical relevance is questionable. Intake of aged participants was positively associated with serum 25(OH)D: individuals with intakes of < once/week, one to six time(s)/week and daily intake had concentrations of approximately 40, 50 and 60 nmol/l respectively (P for trend < 0·001).

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Corresponding author

* Corresponding author: Dr L. Steingrimsdottir, fax +354 543 4824, email laufey@hi.is

References

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