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ORIGINAL RESEARCH article

Front. Nutr.
Sec. Clinical Nutrition
Volume 12 - 2025 | doi: 10.3389/fnut.2025.1514430

Associations of dietary inflammation index and composite dietary antioxidant index with all-cause mortality in COPD patients

Provisionally accepted
Sue Zhao Sue Zhao 1*Yingjie Su Yingjie Su 2*Hongzhong Yang Hongzhong Yang 1*
  • 1 Department of Pulmonary and Critical Care Medicine, Changsha Central Hospital, Changsha, Anhui Province, China
  • 2 Changsha Central Hospital, Changsha, China

The final, formatted version of the article will be published soon.

    Background: Few studies have investigated the effects of both dietary inflammatory index (DII) and composite dietary antioxidant index (CDAI) on mortality in patients with Chronic Obstructive Pulmonary Disease (COPD). Our research aimed to explore the associations between the two indicators with all-cause mortality in COPD patients.: We conducted a prospective cohort analysis based on data from the six cycles of the National Health and Nutrition Examination Survey (NHANES) dataset from 2007 to 2018. Multivariate Cox proportional hazard models were used to analyze the effects of DII and CDAI on all-cause mortality in COPD. We employed restricted cubic spline (RCS) analysis to examine the dose-response relationship between two indicators and all-cause mortality, used threshold effect analysis to determine the inflection point, and conducted subgroup analysis and interaction tests to verify the stability of the results. Results: A total of 1,457 COPD patients aged over 40 were enrolled in the study. The median follow-up time was 76.8 months. The multivariate Cox proportional hazards model showed that increased DII was associated with an increase in all-cause mortality (HR (95% CI):1.11(1.04, 1.18), P = 0.002). In contrast, CDAI was negatively correlated with all-cause mortality (HR (95% CI): 0.95(0.91, 0.99), P = 0.01). The RCS analysis showed a nonlinear correlation between DII or CDAI and all-cause mortality. The maximum pro-inflammatory inflection point of DII was 2.32, while the antioxidant threshold of CDAI is -0.12. Subgroup analyses indicated that the relationship between exposure variables and all-cause mortality was stable in most populations.Reducing the pro-inflammatory diet or increasing the antioxidant diet can reduce all-cause mortality in COPD patients.

    Keywords: chronic obstructive pulmonary disease, Dietary inflammatory index, Composite Dietary Antioxidant Index, Mortality, NHANES

    Received: 20 Oct 2024; Accepted: 03 Jan 2025.

    Copyright: © 2025 Zhao, Su and Yang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Sue Zhao, Department of Pulmonary and Critical Care Medicine, Changsha Central Hospital, Changsha, 410004, Anhui Province, China
    Yingjie Su, Changsha Central Hospital, Changsha, China
    Hongzhong Yang, Department of Pulmonary and Critical Care Medicine, Changsha Central Hospital, Changsha, 410004, Anhui Province, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.