Abstract
Hypertension is a major public health challenge globally and in Iran. Given the role of inflammation in hypertension development, this study aimed to examine the association between the inflammatory potential of diet, quantified using the energy-adjusted Dietary Inflammatory Index (E-DII™), and the incidence of hypertension. The data of the present study were extracted from the Fasa Adult Cohort Study database. In this prospective cohort study, 10,138 participants were recruited at the baseline phase. Participants were contacted by telephone at regular intervals over 7 years. A selected group was also revisited after 5 years. Survival analysis was conducted to investigate the association between E-DII and hypertension incidence over a 7-year follow-up period, using Cox regression. Participants in the highest E-DII tertile (most pro-inflammatory diet) had a significantly higher risk for hypertension incidence during 7 years (HRT3 vs. T1 = 2.24, P value < 0.001). Moreover, the association of E-DII with hypertension incidence after 5 years was examined using logistic regression. Logistic regression revealed a significantly higher hypertension incidence after 5 years among participants in the highest E-DII tertile (ORT3 vs. T1 = 2.62, P value < 0.001). Linear regression showed positive and significant associations between E-DII and change in blood pressure components over 5 years. However, the associations in all models were attenuated and became statistically insignificant after adjustment for body mass index. Our findings indicate that consuming a pro-inflammatory diet was associated with an increased risk of developing hypertension. Moreover, body mass index emerged as a key covariate in this relationship.

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Conceptualization: HP, MS, and AN; methodology: HP and AD; software: HP; validation: RH, MF, and AD; formal analysis: HP and AD; investigation: AD, MF, and RH; resources: AD, MF, and RH; data curation: AD; writing—original draft preparation: HP, AN, and MS; writing—review and editing: FV, MF, RH, and JRH; visualization: HP and AN; supervision: FV and RH; project administration: AD and RH. All authors have read and agreed to the published version of the manuscript.
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All authors except JRH disclose no conflict of interest. JRH discloses that he owns a controlling interest in Connecting Health Innovations LLC (CHI), a company that has licensed the right to his invention of the dietary inflammatory index (DII®) from the University of South Carolina to develop computer and smartphone applications for patient counseling and dietary intervention in clinical settings. CHI owns the exclusive right to the E-DII™.
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All steps of this cohort study followed the Helsinki Declaration and were confirmed by the Ethics Committee of Fasa University of Medical Sciences (IR.FUMS.REC.1402.108). All participants of FACS provided written informed consent and were aware of the study’s aim.
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Nikpour, A., Pourmontaseri, H., Sepehrinia, M. et al. The association between pro-inflammatory diet and incidence of hypertension: a prospective cohort study. Hypertens Res 49, 1749–1759 (2026). https://doi.org/10.1038/s41440-026-02585-w
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DOI: https://doi.org/10.1038/s41440-026-02585-w


