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Shining the light on sunshine: a systematic review of the influence of sun exposure on type 2 diabetes mellitus-related outcomes

Shore-Lorenti,C, Brennan,SL, Sanders,KM, Neale,RE, Lucas,RM and Ebeling,PR 2014, Shining the light on sunshine: a systematic review of the influence of sun exposure on type 2 diabetes mellitus-related outcomes, Clinical endocrinology, vol. 81, no. 6, pp. 799-811, doi: 10.1111/cen.12567.

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Title Shining the light on sunshine: a systematic review of the influence of sun exposure on type 2 diabetes mellitus-related outcomes
Author(s) Shore-Lorenti,C
Brennan,SL
Sanders,KM
Neale,RE
Lucas,RM
Ebeling,PR
Journal name Clinical endocrinology
Volume number 81
Issue number 6
Start page 799
End page 811
Publisher Wiley-Blackwell Publishing
Place of publication Chichester, England
Publication date 2014-12-01
ISSN 0300-0664
1365-2265
Summary Prospective observational studies uniformly link vitamin D deficiency with the incidence of type 2 diabetes mellitus (T2DM), yet trials supplementing participants at risk of T2DM with vitamin D to reduce progression to T2DM have yielded inconsistent results. Inconsistencies between supplementation trials may be due to insufficient dosing or small sample sizes. Observational studies may also have reported spurious associations due to uncontrolled confounding by lifestyle or genetic factors. Alternatively, observational and intervention studies may not be entirely comparable. Observational studies show an association between higher vitamin D status, which is predominantly derived from sun exposure, and decreased incidence of T2DM. Trials intervene with vitamin D supplementation, and therefore may be missing alternate causes of the effect of sun exposure, as seen in observational studies. We propose that sun exposure may be the driving force behind the associations seen in observational studies; sun exposure may have additional benefits beyond increasing serum 25-hydroxyvitamin D (25OHD) levels. We performed an electronic literature search to identify articles that examined associations between sun exposure and T2DM and/or glucose metabolism. A best evidence synthesis was then conducted using outcomes from analyses deemed to have high methodological quality. Ten eligible full-text articles were identified, yielding 19 T2DM-related outcomes. The best evidence analysis considered 11 outcomes which were grouped into six outcome types: T2DM, fasting glucose, glucose tolerance, fasting insulin, insulin secretion and insulin sensitivity. There was moderate evidence to support a role of recreational sun exposure in reducing odds of T2DM incidence. High-level evidence was lacking; evidence presented for other outcomes was of low or insufficient level. This review highlights significant gaps in research pertaining to sun exposure and T2DM-related outcomes. Further research is encouraged as we aim to identify novel preventative strategies for T2DM.
Language eng
DOI 10.1111/cen.12567
Field of Research 119999 Medical and Health Sciences not elsewhere classified
Socio Economic Objective 920104 Diabetes
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Wiley-Blackwell Publishing
Persistent URL http://hdl.handle.net/10536/DRO/DU:30071512

Document type: Journal Article
Collection: School of Medicine
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Created: Thu, 19 Mar 2015, 13:06:23 EST

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