Comparison of mediterranean and healthy eating guideline interventions on the dietary inflammatory index in rheumatoid arthritis: results from a dietary randomised controlled intervention trial

Summary

What the study found

Both a Mediterranean Diet and general healthy eating guidelines significantly reduced the inflammatory potential of the diet in adults with Rheumatoid Arthritis. While diet quality improved across the board, these nutritional changes did not lead to a measurable reduction in patient-reported symptoms like pain or physical disability during the study period.

Key findings

• Both the Mediterranean Diet and the Irish Healthy Eating Guidelines were equally effective at lowering scores on the Dietary Inflammatory Index.
• Participants who achieved the most anti-inflammatory dietary scores consumed significantly more omega-3 fatty acids, dietary fiber, and antioxidant vitamins (A, E, and beta-carotene).
• There were no statistically significant improvements in patient-reported outcome measures (PROMs), suggesting that dietary changes did not immediately alter the participants' perception of their disease.
• The study confirms that following structured dietary advice is a reliable way to shift toward a more anti-inflammatory nutritional profile.

Practical takeaways

Shifting toward a diet high in fiber and healthy fats is a validated strategy for reducing systemic inflammation markers. For those with chronic inflammatory conditions, focusing on nutrient-dense whole foods is more important than choosing one specific diet "label," though it may take longer than 12 weeks for these internal changes to translate into noticeable symptomatic relief.

Limitations

The small sample size of 40 participants may have made it difficult to detect subtle improvements in symptoms. Additionally, the 12-week timeframe might be too short to observe significant changes in long-standing autoimmune symptoms compared to internal inflammatory markers.

Abstract