Observational studies have shown associations between coffee and tea consumption and risk of intracranial aneurysm (IA). However, the results are not consistent. We conducted a Mendelian randomization study to clarify whether genetically predicted coffee and tea consumption has a causal effect on IA and its subtypes.
Genetic variants associated with coffee and tea consumption (cups/day) were obtained from large genome-wide association studies (GWASs), up to 349,376 subjects. Summary-level data for IA were adopted from a GWAS in 79,429 subjects (23 cohorts, 7495 cases, and 71,934 controls).
Genetically predicted coffee consumption was associated with a higher risk of any IA and aneurysmal subarachnoid hemorrhage (SAH), but not with unruptured IA. The ORs per 1 cup/day increase in genetically predicted coffee consumption were 1.42 (95% CI: 1.09–1.86; P = 0.010) for IA, 1.51 (95% CI: 1.13–2.03; P = 0.005) for aneurysmal SAH, and 1.20 (95% CI: 0.74–1.96; P = 0.460) for unruptured IA. Genetically predicted tea consumption was not associated with risk of any IA and its subtypes (P > 0.05). The associations remained consistent in sensitivity analyses, and no evidence of pleiotropy was detected.
Our study provides evidence to support that coffee consumption may increase the risk of IA and associated hemorrhage. Coffee should be limited for those at high risk of IA and associated hemorrhage.
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The data that supports the findings of this study are available in Supplementary Table 1.
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We thank the International Stroke Genetics Consortium (ISGC) Intracranial Aneurysm working group and UK Biobank. Summary information for intracranial aneurysms was obtained from the ISGC Cerebrovascular Disease Knowledge Portal.
The authors declare no competing interests.
Our analyses used publicly available genome-wide association study summary data. Each study included in this study had already obtained related ethical review board approvals, and all participants provided informed consent.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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Zhang, Z., Wang, M., Yuan, S. et al. Genetically predicted coffee and tea consumption and risk of intracranial aneurysm. Eur J Clin Nutr 77, 811–814 (2023). https://doi.org/10.1038/s41430-023-01295-7