Abstract
Purpose
Diet rich in antioxidant may protect against chronic respiratory disease (CRD), but few studies have evaluated the association between composite dietary antioxidant index (CDAI) and CRD. The study aimed to examine the association of CDAI with the risk of CRD and all-cause mortality in CRD patients from the US.
Methods
Data were obtained from the National Health and Nutrition Examination Survey, 2003–2018. Logistic and Cox regression analyses were used to estimate association of CDAI with CRD and all-cause mortality. Dose-response relationship was examined by restricted cubic spline analyses.
Results
Total 44,094 participants were eligible for CRD (aged 1–85 years; mean age: 45.71 years old), and 7,685 CRD patients for all-cause mortality (median follow-up: 7.58 years; 1,136 deaths before 12/31/2019). The risk for CRD, asthma, and chronic obstructive pulmonary disease was significantly decreased by 13–32% with the increase intake of CDAI, even after adjusting for confounders (all P < 0.001). The relationship between CDAI and three respiratory endpoints was U-shaped (all P for nonlinearity < 0.001). There was an obvious declining trend in the magnitude of mortality risk with the increase of intake of CDAI, especially in patients with asthma. Fully adjusted hazard ratio was 0.72 (95% confidence interval: 0.54–0.95), 0.55 (0.42–0.72), and 0.48 (0.34–0.66) for the second, third, and fourth quartile of CDAI in patients with asthma relative to the first quartile, respectively. The association with CRD risk was significantly modified by smoking status (P-interaction: 0.006).
Conclusion
Our findings indicate that high CDAI is a significant protective factor against CRD and all-cause mortality in the US population.
Data availability
The datasets used and/or analyzed for the current study are available from the corresponding authors on reasonable request.
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Funding
This research was supported by the Public Service Development and Reform Pilot Project of Beijing Medical Research Institute (W. Niu).
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Conceptualization, Jing Wu and Wenquan Niu; methodology, Jing Wu and Wenquan Niu; formal analysis, Jing Wu; data curation, Fangjieyi Zheng and Kening Chen; writing-original draft preparation, Jing Wu; writing-review and editing, Jing Wu, Fangjieyi Zheng, Kening Chen, Xiaoqun Dong, Wenquan Niu; supervision, Wenquan Niu; project administration, Wenquan Niu. All authors have read and agreed to the published version of the manuscript.
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Wu, J., Zheng, F., Chen, K. et al. Composite dietary antioxidant index, chronic respiratory disease, and all-cause mortality: National Health and Nutrition Examination Survey, 2003–2018. Eur J Nutr 64, 19 (2025). https://doi.org/10.1007/s00394-024-03508-6
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DOI: https://doi.org/10.1007/s00394-024-03508-6