Diet-Derived Circulating Antioxidants and Risk of Digestive System Tumors: A Mendelian Randomization Study

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#antioxidants #ascorbic-acid #diet #digestive-system-neoplasms #gastrointestinal-neoplasms

Diet-Derived Circulating Antioxidants and Risk of Digestive System Tumors: A Mendelian Randomization Study

Yin et al., 2022 | Nutrients | Meta Analysis

Citation

Yin Linlin, Yan Haihao, ... Zhang Bin. Diet-Derived Circulating Antioxidants and Risk of Digestive System Tumors: A Mendelian Randomization Study. Nutrients. 2022-Aug-10;14(16). doi:10.3390/nu14163274

Abstract

Previous observational case-control studies have shown significant controversy over the impact of dietary intake-related circulating antioxidants on the risk of digestive system tumors. We conducted a two-sample Mendelian randomized (MR) analysis to determine whether there was a significant causal relationship between increased levels of circulating antioxidants and digestive system tumors. Our circulating antioxidants (vitamin C, carotenoids, vitamin A, and vitamin E) were derived from absolute circulating antioxidants and circulating antioxidant metabolites, and their corresponding instrumental variables were screened from published studies. The digestive system tumors we studied included colorectal, gastric, pancreatic, liver, and esophageal cancer, and the corresponding summary GAWS (genome-wide association study) data were obtained from the UK Biobank database. We first evaluated the causal relationship between each tumor and circulating antioxidants and then used meta-analysis to summarize the results of MR analysis of different tumors. No significant associations were noted for genetically predicted circulating antioxidants and higher risk of digestive system tumors in our study. The pooled ORs (odds ratio) are 0.72 (95% CI: 0.46-1.11; β-carotene), 0.93 (95% CI: 0.81-1.08; lycopene), 2.12 (95% CI: 0.31-14.66; retinol), and 0.99 (95% CI: 0.96-1.02; ascorbate) for absolute circulating antioxidants; for circulating antioxidant metabolites, the pooled ORs for digestive system tumors risk per unit increase of antioxidants were 1.29 (95% CI: 0.39-4.28; α-tocopherol), 1.72 (95% CI: 0.85-3.49; γ-tocopherol), 1.05 (95% CI: 0.96-1.14; retinol), and 1.21 (95% CI: 0.97-1.51; ascorbate), respectively. Our study suggested that increased levels of dietary-derived circulating antioxidants did not reduce the risk of digestive system tumors.

Key Findings

Our study suggested that increased levels of dietary-derived circulating antioxidants did not reduce the risk of digestive system tumors.

Outcomes Measured

  • Requires manual extraction

Population

Field Value
Population See abstract
Sample Size See abstract
Age Range See abstract
Condition See abstract

MeSH Terms

  • Antioxidants
  • Ascorbic Acid
  • Diet
  • Digestive System Neoplasms
  • Gastrointestinal Neoplasms
  • Genome-Wide Association Study
  • Humans
  • Mendelian Randomization Analysis
  • Risk Factors
  • Vitamin A

Evidence Classification

  • Level: Meta Analysis
  • Publication Types: Journal Article, Meta-Analysis
  • Vertical: vitamin-a

Provenance

Source extracted via PubMed E-utilities API on 2026-04-09