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Association between composite dietary antioxidant index and Helicobacter pylori infection: a population-based and Mendelian randomisation study

Published online by Cambridge University Press:  20 June 2025

Peng Zou ,
Fu Xiao ,
Yusong Wei ,
Chengru Chen  and
Xiaobin Wu Open the ORCID record for Xiaobin Wu [Opens in a new window]
Peng Zou
Affiliation:
Department of Gastrointestinal Surgery, The Eighth Affiliated Hospital of Sun Yat-sen University, Sun Yat-sen University, Shenzhen 518033, Guangdong Province, People’s Republic of China
Fu Xiao
Affiliation:
Department of Gastrointestinal Surgery, The Eighth Affiliated Hospital of Sun Yat-sen University, Sun Yat-sen University, Shenzhen 518033, Guangdong Province, People’s Republic of China
Yusong Wei
Affiliation:
Department of Gastrointestinal Surgery, The Eighth Affiliated Hospital of Sun Yat-sen University, Sun Yat-sen University, Shenzhen 518033, Guangdong Province, People’s Republic of China
Chengru Chen*
Affiliation:
Department of Gastrointestinal Surgery, The Eighth Affiliated Hospital of Sun Yat-sen University, Sun Yat-sen University, Shenzhen 518033, Guangdong Province, People’s Republic of China
Xiaobin Wu*
Affiliation:
Department of Gastrointestinal Surgery, The Eighth Affiliated Hospital of Sun Yat-sen University, Sun Yat-sen University, Shenzhen 518033, Guangdong Province, People’s Republic of China
*
Corresponding authors: Chengru Chen; Email: chengruchen@outlook.com, Xiaobin Wu; Email: wuxiaob2@mail.sysu.edu.cn
Corresponding authors: Chengru Chen; Email: chengruchen@outlook.com, Xiaobin Wu; Email: wuxiaob2@mail.sysu.edu.cn
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Abstract

The composite dietary antioxidant index (CDAI) has been identified as a critical factor in the pathogenesis of certain inflammatory diseases. The study aimed to investigate the relationship between CDAI and Helicobacter pylori infection using cross-sectional design. In this study, participants from the 1999–2000 National Health and Nutrition Examination Survey were analysed using logistic and Cox regression analyses to assess the associations between H. pylori infection and CDAI, encompassing vitamin A, vitamin C, vitamin E, carotene, Zn, Se and Cu. The results demonstrated a negative correlation between CDAI scores and H. pylori infection, revealing a non-linear relationship between the odds of H. pylori infection and CDAI as a continuous variable. Subsequently, a two-sample Mendelian randomisation study was conducted utilising genome-wide association study summary statistics to explore the causal relationship between antioxidant levels and H. pylori infection. We found that the intake of Cu was a protective factor in the occurrence of H. pylori infection but did not support a causal association between circulating Cu levels and H. pylori infection. The prevalence of H. pylori infection was found to be elevated among individuals of older age, lower education levels, limited socio-economic status, smokers, diabetes and those with hypertension. The study suggests that higher CDAI is linked to decreased odds of H. pylori infection, and further prospective studies are needed to confirm the association. Our findings may have significant implications for the prevention and management of H. pylori-related diseases.

Keywords

Composite dietary antioxidant indexHelicobacter pyloriNHANESPopulation-based studyMendelian randomisation analysis

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Type
Research Article
Information
British Journal of Nutrition , First View , pp. 1 - 9
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© The Author(s), 2025. Published by Cambridge University Press on behalf of The Nutrition Society

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