Causal Association Between Tea Consumption and Bone Health: A Mendelian Randomization Study.

Area of Science:

• Nutritional Epidemiology
• Genetic Epidemiology
• Bone Metabolism Research

Background:

• Observational studies suggest tea consumption may reduce the risk of osteoarthritis (OA), rheumatoid arthritis (RA), and osteoporosis (OP).
• Existing correlations between tea intake and these bone disorders are inconclusive.
• A causal link requires robust investigation beyond observational data.

Purpose of the Study:

• To determine the causal relationship between genetically predicted tea intake and the risk of OA, RA, and OP.
• To leverage Mendelian randomization (MR) for a robust assessment of tea's impact on bone health.
• To analyze large-scale genetic datasets for genetic predisposition to tea consumption.

Main Methods:

• A two-sample Mendelian randomization (MR) study utilizing large-scale genome-wide association study (GWAS) datasets.
• Genetic data for tea consumption derived from UK Biobank (349,376 participants).
• Case-control data for knee OA, hip OA, RA, and osteoporosis (OP) sourced from UK Biobank and FinnGen.

Main Results:

• Genetically predicted tea consumption showed no statistically significant association with the risk of knee OA, hip OA, RA, or OP.
• Inverse-variance weighted (IVW) and weighted median methods confirmed no causal effect.
• Sensitivity analyses indicated no significant potential pleiotropy, strengthening the findings.

Conclusions:

• This MR study lacked the statistical power to establish a causal relationship between tea consumption and the risk of major bone disorders.
• The findings do not support a direct causal impact of genetically predicted tea intake on OA, RA, or OP.
• Further research with enhanced statistical power may be warranted.