Long-term effects of increasing omega-3, omega-6 and total polyunsaturated fats on inflammatory bowel disease and markers of inflammation: A systematic review and meta-analysis of randomized controlled trials

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Background & Aims: Effects of long-chain omega-3 (LCn3) and omega-6 fatty acids on prevention and treatment of inflammatory bowel diseases (IBD, including Crohn’s Disease, CD and ulcerative colitis, UC), and inflammation are unclear. We systematically reviewed long-term effects of omega-3, omega-6 and total polyunsaturated fats (PUFA) on IBD diagnosis, relapse, severity, pharmacotherapy, quality of life and key inflammatory markers. 
Methods: We searched Medline, Embase, Cochrane CENTRAL, and trials registries, including RCTs in adults with or without IBD comparing higher with lower omega-3, omega-6 and/or total PUFA intake for ≥24 weeks that assessed IBD-specific outcomes or inflammatory biomarkers. 
Results: We included 83 RCTs (41,751 participants), of which 13 recruited participants with IBD. Increasing LCn3 may reduce risk of IBD relapse (RR 0.85, 95% CI 0.72 to 1.01) and IBD worsening (RR 0.85, 95% CI 0.71 to 1.03), and reduce erythrocyte sedimentation rate (ESR, SMD -0.23, 95% CI -0.44 to -0.01), but may increase IBD diagnosis risk (RR 1.10, 95% CI 0.63 to 1.92), and faecal calprotectin, a specific inflammatory marker for IBD (MD 16.1μg/g, 95% CI -37.6 to 69.8, all low-quality evidence). Outcomes for alpha-linolenic acid, omega-6 and total PUFA were sparse, but suggested little or no effect where data were available. 
Conclusion: This is the most comprehensive meta-analysis of RCTs investigating long-term effects of omega-3, omega-6 and total PUFA on IBD and inflammatory markers. Our findings suggest that supplementation with PUFAs has little or no effect on prevention or treatment of IBD and provides little support for modification of long-term inflammatory status.
Original languageEnglish
Pages (from-to)2293–2316
Number of pages24
JournalEuropean Journal of Nutrition
Volume60
Issue number5
Early online date21 Oct 2020
DOIs
Publication statusPublished - Aug 2021

Keywords

  • Inflammatory Bowel Diseases
  • Unsaturated Dietary Fats
  • Omega-3 fatty acids
  • Omega-6 fatty acids
  • alpha-Linolenic Acid
  • Meta-analysis

Cite this