Diet and risk for hernia: a Mendelian randomization analysis.

Area of Science:

• Nutritional Epidemiology
• Gastroenterology
• Genetic Epidemiology

Background:

• The link between diet and hernia development remains poorly understood.
• Investigating specific dietary components' influence on various hernia types is crucial for public health.
• Existing research lacks comprehensive analysis of dietary factors and hernia etiology.

Purpose of the Study:

• To investigate the causal relationships between various dietary factors and the risk of developing inguinal, umbilical, and ventral hernias.
• To utilize large-scale genetic and dietary datasets for robust analysis.
• To identify specific dietary components that may increase or decrease hernia risk.

Main Methods:

• Leveraged UK Biobank for dietary exposure data (alcohol, fish, fruits, salt, cheese, etc.).
• Employed FinnGen biobank for genome-wide association study (GWAS) data on hernia outcomes.
• Utilized Mendelian randomization methods (weighted median, MR-Egger, IVW) for causal inference, with heterogeneity and outlier analyses (Cochran's Q, MR-PRESSO).

Main Results:

• Weekly alcohol consumption was associated with a reduced risk of inguinal hernia (OR: 0.614).
• Increased alcohol intake frequency correlated with higher ventral hernia risk (OR: 1.309).
• Non-oily fish intake increased inguinal hernia risk (OR: 2.945), while salt intake increased umbilical hernia risk (OR: 1.841).
• Cheese (OR: 0.434) and dried fruit (OR: 0.322) intake decreased ventral hernia risk, whereas cooked vegetables increased it (OR: 4.475).

Conclusions:

• Specific dietary factors, including alcohol, non-oily fish, salt, cheese, dried fruit, and cooked vegetables, are causally associated with different types of hernias.
• Findings highlight the potential role of diet in hernia prevention and management.
• Further research is warranted to elucidate the mechanisms underlying these dietary associations with hernia development.