Veggies and Intact Grains a Day Keep the Pathogens Away

Area of Science:

• Microbiology
• Immunology
• Nutrition Science

Background:

• Dietary fiber is essential for maintaining gut homeostasis.
• The gut microbiota plays a critical role in host health and disease susceptibility.
• Specific dietary components can modulate the composition and function of the gut microbiota.

Purpose of the Study:

• To investigate the impact of dietary fiber on gut microbiota composition.
• To determine the relationship between dietary fiber, gut microbiota, and susceptibility to enteric infection.
• To identify specific bacterial taxa affected by fiber deprivation.

Main Methods:

• Comparison of gut microbiota composition in mice fed standard versus fiber-free diets.
• Assessment of susceptibility to Citrobacter rodentium infection in different dietary groups.
• Analysis of bacterial populations, including mucus-degrading species.

Main Results:

• A fiber-free diet led to an enrichment of mucus-degrading bacteria in the gut.
• Mice on a fiber-free diet exhibited increased susceptibility to Citrobacter rodentium infection.
• Specific bacterial groups associated with mucus degradation were identified and quantified.

Conclusions:

• Dietary fiber deprivation promotes the growth of mucus-degrading bacteria.
• Reduced dietary fiber compromises the gut barrier function, increasing infection susceptibility.
• Maintaining adequate dietary fiber intake is crucial for gut health and defense against pathogens.