Noncausal effects between tea intake and migraine risk: a Mendelian randomization study

Area of Science:

• Genetics
• Epidemiology
• Neurology

Background:

• Observational studies show conflicting results on tea intake and migraine risk.
• Residual confounding and reverse causality limit traditional observational studies.
• Establishing causal links is crucial for migraine prevention strategies.

Purpose of the Study:

• To determine the causal inference between tea intake and migraine risk.
• To investigate the relationship for any migraine, migraine with aura, and migraine without aura.
• To provide evidence for disease screening and prevention.

Main Methods:

• A two-sample Mendelian randomization (MR) study was conducted.
• Genetic variants for tea intake were obtained from UK Biobank GWAS.
• Migraine data (any migraine, with aura, without aura) were sourced from the International Headache Genetics Consortium GWAS.
• Inverse variance weighting (IVW) with fixed effects was the primary analysis method.
• Sensitivity analyses including MR-PLEIOTROPY RESIDUAL SUM AND OUTLIER (MR-PRESSO) assessed robustness.

Main Results:

• No causal relationship was found between tea intake and the risk of any migraine (OR, 0.94; 95% CI, 0.70-1.25; P=0.65).
• No causal relationship was found between tea intake and migraine with aura (OR, 0.93; 95% CI, 0.51-1.72; P=0.83).
• No causal relationship was found between tea intake and migraine without aura (OR, 0.90; 95% CI, 0.52-1.54; P=0.69).
• Sensitivity analyses confirmed no significant pleiotropy or heterogeneity.

Conclusions:

• This Mendelian randomization study found no evidence of a causal effect of tea intake on migraine risk in European populations.
• Changing tea drinking habits is unlikely to be an effective strategy for migraine risk reduction.
• Further research may explore other dietary factors or genetic predispositions in migraine etiology.