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Different coffee consumption patterns affect HbA1c via propionic acid-producing gut microbiota.

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|December 7, 2025
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This summary is machine-generated.

Drinking unsweetened filter coffee boosts beneficial gut bacteria (Veillonella), which helps lower blood sugar (HbA1c). This suggests coffee may aid diabetes management by influencing gut health.

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Area of Science:

  • Gut Microbiota and Metabolism
  • Nutritional Epidemiology
  • Genetic Epidemiology

Background:

  • Glycated haemoglobin (HbA1c) is a key indicator of long-term blood glucose control.
  • Gut microbiota composition is increasingly recognized for its role in metabolic health.
  • Coffee consumption is widespread, but its specific impact on gut microbiota and glycaemic control requires elucidation.

Purpose of the Study:

  • To investigate the causal links between coffee intake, gut microbiota, and HbA1c levels.
  • To identify specific gut bacteria mediating the effect of coffee on glycaemic control.
  • To explore the potential of coffee as a dietary strategy for managing blood sugar.

Main Methods:

  • Mendelian randomization (MR) analysis utilizing large-scale genome-wide association study (GWAS) data from UK Biobank and MiBioGen.
  • Inverse variance weighted (IVW) method as the primary analytical technique.
  • Robustness checks using sensitivity analyses to validate findings.

Main Results:

  • A significant causal pathway was identified: unsweetened filter coffee consumption positively influences the abundance of Veillonella bacteria.
  • Increased Veillonella abundance was causally associated with reduced HbA1c levels.
  • This suggests a mediating role for Veillonella in the coffee-HbA1c relationship.

Conclusions:

  • Unsweetened filter coffee consumption may improve glycaemic control through modulation of the gut microbiota, specifically by increasing Veillonella.
  • These findings offer novel insights into the gut-intestinal microbiota-metabolism axis.
  • Dietary habits and coffee preparation methods are important considerations for leveraging coffee's potential in diabetes management.