Nutritional Influences on Inflammatory Bowel Disease

Inflammatory bowel disease (IBD), encompassing Crohn’s disease and ulcerative colitis, arises from complex interactions between genetic predisposition, the immune system and environmental factors, among which diet is increasingly recognised as pivotal. Nutrients modulate gut homeostasis both directly, by influencing epithelial integrity and immune signalling, and indirectly, through shaping the composition and function of the intestinal microbiota. Western‐style diets high in refined sugars, saturated fats and animal products tend to promote microbial dysbiosis, barrier disruption and pro‐inflammatory pathways, whereas diets rich in dietary fibre, omega-3 fatty acids and plant‐derived nutrients foster short-chain fatty acid (SCFA) production, strengthen mucosal defences and support regulatory immune responses. Translational research has detailed mechanisms by which specific dietary components alter epithelial signalling (for example through fatty acid‐induced post-translational modifications), influence microbial metabolite profiles and modulate systemic inflammation. In parallel, clinical studies are refining nutritional therapies—from exclusive enteral nutrition in paediatric Crohn’s disease to precision exclusion diets in adults—with the aim of achieving durable remission while minimising pharmacological burdens. Ongoing efforts to characterise individual dietary responses through microbiome and metabolomic profiling promise a future of personalised, evidence-based nutritional interventions in IBD care.

Research from Nature Portfolio

Recent studies have elucidated the effects of dietary composition on mucosal barrier integrity and inflammatory pathways. In murine models, short-term exposure to a high-sugar diet markedly reduced luminal concentrations of short-chain fatty acids, increased epithelial permeability and exacerbated chemically induced colitis; oral acetate supplementation reversed these effects, underscoring the protective role of microbial metabolites. In human subjects with Crohn’s disease, serum profiles of polyunsaturated fatty acids were found to correlate tightly with pro-inflammatory cytokine levels and clinical disease activity, suggesting that altered lipid metabolism may both reflect and influence disease severity.

Nutritional Influences on Inflammatory Bowel Disease publication trend

The graph below shows the total number of articles in nutritional influences on inflammatory bowel disease across all publications each year (not limited to Nature Index journals).

Technical terms

Short-chain fatty acids (SCFAs): Metabolic by-products of dietary fibre fermentation by gut bacteria that strengthen the intestinal barrier and modulate immune responses.

Long-chain fatty acids (LCFAs): Fatty acids with 13–21 carbon atoms that can influence inflammation and epithelial signalling when present in high-fat diets.

Palmitoylation: A reversible lipid modification in which palmitic acid is covalently attached to proteins, affecting their localisation and activity in inflammatory pathways.

Exclusive enteral nutrition (EEN): A dietary therapy in which all nutritional requirements are met through a defined liquid formula, used to induce remission in Crohn’s disease.

References

1. The Impact of Western Diet and Nutrients on the Microbiota and Immune Response at Mucosal Interfaces. Frontiers in Immunology (2017).
2. A high-sugar diet rapidly enhances susceptibility to colitis via depletion of luminal short-chain fatty acids in mice. Scientific Reports (2019).
3. Serum Polyunsaturated Fatty Acids Correlate with Serum Cytokines and Clinical Disease Activity in Crohn’s Disease. Scientific Reports (2019).
4. Dietary long-chain fatty acids promote colitis by regulating palmitoylation of STAT3 through CD36-mediated endocytosis. Cell Death & Disease (2024).
5. Long-term dietary patterns are associated with pro-inflammatory and anti-inflammatory features of the gut microbiome. Gut (2021).
6. Diet fuelling inflammatory bowel diseases: preclinical and clinical concepts. Gut (2022).