Dried fruit, acetate, and asthma: a mediation Mendelian randomization analysis

Area of Science:

• Nutritional Epidemiology
• Metabolic Pathways
• Respiratory Health

Background:

• Asthma prevalence is rising globally, necessitating research into environmental and dietary factors.
• The specific mechanisms linking diet, such as dried fruit consumption, to asthma risk are not well understood.
• Acetate is explored as a potential mediator in the relationship between dried fruit intake and asthma.

Purpose of the Study:

• To investigate the causal effect of dried fruit consumption on asthma risk.
• To examine the role of acetate levels as a potential mediator in this relationship.
• To explore dietary strategies for asthma prevention and management.

Main Methods:

• Utilized Mendelian Randomization (MR) analysis to assess causal relationships.
• Employed three MR methods: Inverse-Variance Weighted (IVW), Weighted Median (WM), and MR-Egger.
• Performed mediation analysis to quantify the indirect effect of dried fruit on asthma via acetate.

Main Results:

• Dried fruit intake showed a significant inverse association with asthma risk (IVW: β = -0.506, p = 0.0135).
• Increased dried fruit consumption was positively associated with higher acetate levels (IVW: β = 0.269, p < 0.0001).
• Higher acetate levels were independently linked to reduced asthma risk (IVW: β = -0.361, p < 0.0001), with acetate mediating ~19.22% of the effect.

Conclusions:

• Dried fruit consumption appears to reduce asthma risk, with acetate acting as a significant mediator.
• The acetate pathway accounts for approximately 20% of the observed protective effect of dried fruits.
• Findings suggest that dietary interventions focusing on dried fruits and acetate metabolism may offer a novel approach for asthma management.