Plasma retinol and total carotenes and fracture risk after long-term supplementation with high doses of retinol
Observational studies suggest that moderate intakes of retinol and increased circulating retinol levels may increase fracture risk. Easy access to supplements, combined with an aging population, makes this a potentially important association. The aim of this study was to investigate plasma retinol a...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
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Elsevier Inc.
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/10149 |
| _version_ | 1848746152664498176 |
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| author | Ambrosini, G. Alfonso, Helman Reid, Alison Mackerras, D. Bremner, A. Beilby, J. Olsen, N. Musk, A. de Klerk, N. |
| author_facet | Ambrosini, G. Alfonso, Helman Reid, Alison Mackerras, D. Bremner, A. Beilby, J. Olsen, N. Musk, A. de Klerk, N. |
| author_sort | Ambrosini, G. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Observational studies suggest that moderate intakes of retinol and increased circulating retinol levels may increase fracture risk. Easy access to supplements, combined with an aging population, makes this a potentially important association. The aim of this study was to investigate plasma retinol and total carotene concentrations in relation to fracture risk after long-term supplementation with retinol and/or beta-carotene in 998 adults between 1990 and 2007. Methods: Participants were 663 men and 335 women in a cancer prevention program who were initially randomized to a retinol (7.5 mg RE/d) or beta-carotene (30 mg/d) supplement between 1990 and 1996. After 1996, all participants received the retinol supplement only. Plasma retinol and total carotene, medication use and various lifestyle factors were measured at annual clinic visits. Fractures were identified by self-report in 2007. The risk for any fracture or osteoporotic fracture was modeled using Cox proportional hazard models.Results: Over a median follow-up of 7.8 y, 123 participants with plasma samples reported an incident fracture. Although plasma retinol concentrations were markedly higher than those reported in observational studies, no association was observed between plasma retinol and risk for any fracture (hazard ratio [HR], 0.86 μmol/L; 95% confidence interval [CI], 0.65–1.14) or osteoporotic fracture (HR, 0.97 μmol/L; 95% CI, 0.66–1.43). A lower risk for any fracture was suggested with increasing plasma total carotenes (HR, 0.85 μmol/L; 95% CI, 0.71–1.01). Conclusions: This study does not support earlier reports of an increased fracture risk associated with increased plasma retinol concentration. The potential for carotenes to prevent fractures deserves further investigation. |
| first_indexed | 2025-11-14T06:28:43Z |
| format | Journal Article |
| id | curtin-20.500.11937-10149 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:28:43Z |
| publishDate | 2014 |
| publisher | Elsevier Inc. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-101492017-09-13T14:52:04Z Plasma retinol and total carotenes and fracture risk after long-term supplementation with high doses of retinol Ambrosini, G. Alfonso, Helman Reid, Alison Mackerras, D. Bremner, A. Beilby, J. Olsen, N. Musk, A. de Klerk, N. Retinol Carotene Plasma Intervention study Vitamin A Fractures Biomarkers Observational studies suggest that moderate intakes of retinol and increased circulating retinol levels may increase fracture risk. Easy access to supplements, combined with an aging population, makes this a potentially important association. The aim of this study was to investigate plasma retinol and total carotene concentrations in relation to fracture risk after long-term supplementation with retinol and/or beta-carotene in 998 adults between 1990 and 2007. Methods: Participants were 663 men and 335 women in a cancer prevention program who were initially randomized to a retinol (7.5 mg RE/d) or beta-carotene (30 mg/d) supplement between 1990 and 1996. After 1996, all participants received the retinol supplement only. Plasma retinol and total carotene, medication use and various lifestyle factors were measured at annual clinic visits. Fractures were identified by self-report in 2007. The risk for any fracture or osteoporotic fracture was modeled using Cox proportional hazard models.Results: Over a median follow-up of 7.8 y, 123 participants with plasma samples reported an incident fracture. Although plasma retinol concentrations were markedly higher than those reported in observational studies, no association was observed between plasma retinol and risk for any fracture (hazard ratio [HR], 0.86 μmol/L; 95% confidence interval [CI], 0.65–1.14) or osteoporotic fracture (HR, 0.97 μmol/L; 95% CI, 0.66–1.43). A lower risk for any fracture was suggested with increasing plasma total carotenes (HR, 0.85 μmol/L; 95% CI, 0.71–1.01). Conclusions: This study does not support earlier reports of an increased fracture risk associated with increased plasma retinol concentration. The potential for carotenes to prevent fractures deserves further investigation. 2014 Journal Article http://hdl.handle.net/20.500.11937/10149 10.1016/j.nut.2013.10.007 Elsevier Inc. restricted |
| spellingShingle | Retinol Carotene Plasma Intervention study Vitamin A Fractures Biomarkers Ambrosini, G. Alfonso, Helman Reid, Alison Mackerras, D. Bremner, A. Beilby, J. Olsen, N. Musk, A. de Klerk, N. Plasma retinol and total carotenes and fracture risk after long-term supplementation with high doses of retinol |
| title | Plasma retinol and total carotenes and fracture risk after long-term supplementation with high doses of retinol |
| title_full | Plasma retinol and total carotenes and fracture risk after long-term supplementation with high doses of retinol |
| title_fullStr | Plasma retinol and total carotenes and fracture risk after long-term supplementation with high doses of retinol |
| title_full_unstemmed | Plasma retinol and total carotenes and fracture risk after long-term supplementation with high doses of retinol |
| title_short | Plasma retinol and total carotenes and fracture risk after long-term supplementation with high doses of retinol |
| title_sort | plasma retinol and total carotenes and fracture risk after long-term supplementation with high doses of retinol |
| topic | Retinol Carotene Plasma Intervention study Vitamin A Fractures Biomarkers |
| url | http://hdl.handle.net/20.500.11937/10149 |