Vitamin levels were associated with gastrointestinal cancer odds
A meta-analysis linked higher dietary and blood levels of vitamins B and D with lower gastrointestinal cancer odds. Possible differences associated with genetic variation remain uncertain.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Higher dietary intake and blood levels of vitamins B and D were associated with lower gastrointestinal cancer odds. The review also examined whether genetic variants changed these associations. These findings do not establish that vitamins prevent cancer or that genetic information identifies people who would benefit from taking vitamin supplements.
The abstract omits intake thresholds, reference categories, follow-up periods and underlying study-design details. Significant results in some genetic subgroups and nonsignificant results in others do not alone establish differences between those subgroups.
Understanding the odds estimate
For dietary vitamin B, gastrointestinal cancer odds were 0.84 times those in an unspecified reference group (95% confidence interval 0.79–0.90). The interval describes uncertainty around the relative estimate, rather than an individual’s chance of cancer.
Genetic patterns need confirmation
The review examined variants in genes involved in vitamin metabolism. Some subgroup associations reached statistical significance and others did not. The authors describe genetic modification as a possibility; these patterns do not establish personalized supplementation benefits.
The original publication
Dietary and Circulating Vitamins, Polymorphisms of Vitamin Metabolism Genes, and the Risk of Gastrointestinal Cancers: A Systematic Review and Meta-Analysis.
Wang XL, Xu HM, Hu ZQ et al.
Clin Transl Gastroenterol · 2025
- PubMed ID
- 40758155
- Record checked
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