Document Detail

Omega-3 fatty acids and incident type 2 diabetes: a systematic review and meta-analysis.
MedLine Citation:
PMID:  22591895     Owner:  NLM     Status:  MEDLINE    
The relationship between omega-3 polyunsaturated fatty acids (n-3 PUFA) from seafood sources (eicosapentaenoic acid, EPA; docosahexaenoic acid, DHA) or plant sources (alpha-linolenic acid, ALA) and risk of type 2 diabetes mellitus (DM) remains unclear. We systematically searched multiple literature databases through June 2011 to identify prospective studies examining relations of dietary n-3 PUFA, dietary fish and/or seafood, and circulating n-3 PUFA biomarkers with incidence of DM. Data were independently extracted in duplicate by 2 investigators, including multivariate-adjusted relative risk (RR) estimates and corresponding 95 % CI. Generalized least-squares trend estimation was used to assess dose-response relationships, with pooled summary estimates calculated by both fixed-effect and random-effect models. From 288 identified abstracts, 16 studies met inclusion criteria, including 18 separate cohorts comprising 540,184 individuals and 25,670 cases of incident DM. Consumption of fish and/or seafood was not significantly associated with DM (n = 13 studies; RR per 100 g/d = 1·12, 95 % CI = 0·94, 1·34); nor were consumption of EPA+DHA (n = 16 cohorts; RR per 250 mg/d = 1·04, 95 % CI = 0·97, 1·10) nor circulating levels of EPA+DHA biomarkers (n = 5 cohorts; RR per 3 % of total fatty acids = 0·94, 95 % CI = 0·75, 1·17). Both dietary ALA (n = 7 studies; RR per 0·5 g/d = 0·93, 95 % CI = 0·83, 1·04) and circulating ALA biomarker levels (n = 6 studies; RR per 0·1 % of total fatty acid = 0·90, 95 % CI = 0·80, 1·00, P = 0·06) were associated with non-significant trend towards lower risk of DM. Substantial heterogeneity (I²~80 %) was observed among studies of fish/seafood or EPA+DHA and DM; moderate heterogeneity ( < 55 %) was seen for dietary and biomarker ALA and DM. In unadjusted meta-regressions, study location (Asia vs. North America/Europe), mean BMI, and duration of follow-up each modified the association between fish/seafood and EPA+DHA consumption and DM risk (P-interaction ≤ 0·02 each). We had limited statistical power to determine the independent effect of these sources of heterogeneity due to their high collinearity. The overall pooled findings do not support either major harms or benefits of fish/seafood or EPA+DHA on development of DM, and suggest that ALA may be associated with modestly lower risk. Reasons for potential heterogeneity of effects, which could include true biologic heterogeneity, publication bias, or chance, deserve further investigation.
Jason H Y Wu; Renata Micha; Fumiaki Imamura; An Pan; Mary L Biggs; Owais Ajaz; Luc Djousse; Frank B Hu; Dariush Mozaffarian
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Publication Detail:
Type:  Journal Article; Meta-Analysis; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  The British journal of nutrition     Volume:  107 Suppl 2     ISSN:  1475-2662     ISO Abbreviation:  Br. J. Nutr.     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-05-17     Completed Date:  2012-07-19     Revised Date:  2013-08-20    
Medline Journal Info:
Nlm Unique ID:  0372547     Medline TA:  Br J Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  S214-27     Citation Subset:  IM    
Department of Epidemiology, Harvard School of Public Health, Boston, 665 Huntington Ave, Kresge Building-913, Boston MA 02115, USA.
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MeSH Terms
Diabetes Mellitus, Type 2 / etiology,  prevention & control*
Dietary Fats / administration & dosage*
Fatty Acids, Omega-3 / blood,  pharmacology,  therapeutic use*
Plant Oils / pharmacology,  therapeutic use
Grant Support
Reg. No./Substance:
0/Dietary Fats; 0/Fatty Acids, Omega-3; 0/Plant Oils

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