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Obesity and cancer: the role of vitamin D
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2014 (English)In: BMC Cancer, ISSN 1471-2407, E-ISSN 1471-2407, Vol. 14, 712- p.Article in journal (Refereed) Published
Abstract [en]

Background: It is estimated that 20% of all cancer cases are caused by obesity. Vitamin D is thought to be one of the mechanisms underlying this association. This review aims to summarise the evidence for the mediating effect of vitamin D on the link between obesity and cancer. Methods: Three literature searches using PubMed and Embase were conducted to assess whether vitamin D plays an important role in the pathway between obesity and cancer: (1) obesity and cancer; (2) obesity and vitamin D; and (3) vitamin D and cancer. A systematic review was performed for (1) and (3), whereas a meta-analysis including random effects analyses was performed for (2). Results: (1) 32 meta-analyses on obesity and cancer were identified; the majority reported a positive association between obesity and risk of cancer. (2) Our meta-analysis included 12 original studies showing a pooled relative risk of 1.52 (95% CI: 1.33-1.73) for risk of vitamin D deficiency (<50 nmol/L) in obese people (body mass index >30 kg/m(2)). (3) 21 meta-analyses on circulating vitamin D levels and cancer risk were identified with different results for different types of cancer. Conclusion: There is consistent evidence for a link between obesity and cancer as well as obesity and low vitamin D. However, it seems like the significance of the mediating role of vitamin D in the biological pathways linking obesity and cancer is low. There is a need for a study including all three components while dealing with bias related to dietary supplements and vitamin D receptor polymorphisms.

Place, publisher, year, edition, pages
2014. Vol. 14, 712- p.
Keyword [en]
Cancer, Obesity, Vitamin D
National Category
Cancer and Oncology
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URN: urn:nbn:se:uu:diva-235324DOI: 10.1186/1471-2407-14-712ISI: 000342466900001OAI: oai:DiVA.org:uu-235324DiVA: diva2:761030
Available from: 2014-11-05 Created: 2014-10-30 Last updated: 2017-12-05Bibliographically approved

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Holmberg, Lars

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