| Objectives: This study aimed, at first, to assess Dietary Inflammatory Index (DII) in
participants with rheumatoid arthritis (RA) and compare them with healthy controls.
Then, to evaluate the association of DII with the risk of RA occurrence, the severity
of disease, and systemic inflammation.
Methods: This case-control study enrolled 100 newly diagnosed cases with RA and
100 age and sex-matched healthy controls. DII was computed based on the individuals’ FFQ-derived dietary data. Serum levels of inflammatory markers, including
the high sensitivity C-reactive protein (hs-CRP) and Tumour Necrosis Factor-alpha
(TNF-α), were measured using the ELISA method; and the severity of the disease was
assessed based on the disease activity score 28 (DAS-28).
Results: The mean DII score was higher in the RA patients as compared with that in
the controls (0.66 ± 0.23 vs. −0.58 ± 0.19, P = .002). Patients with the highest DII
had significantly higher serum inflammatory (hs-CRP and TNF) and clinical markers
(DAS-28 score and the number of tender joints). A significant univariate relationship
between DII score and risk of RA incident [6.48 (95% CI: 1.79 to 23.44)] disappeared
in multivariate analysis. For each 1-unit increase in DII, the DAS-28 score was raised
by 1.11 times (P = .001).
Conclusion: An inflammatory diet may act as a potential risk factor contributing to
the development of RA and its severity. Therefore, dietary modification with the
goal of reducing the DII score could be a beneficial strategy to improve the clinical
outcomes in such patients. |