TGR5 (Takeda G Protein-Coupled Receptor 5) and Energy Balance

What Is TGR5?

TGR5 is a receptor located in the gut, muscles, and brown fat. It responds directly to bile acids.

When activated, TGR5 improves how the body burns energy and manages fats.

Diet, Fermentation, and TGR5

Like FXR, TGR5 depends on which bile acids circulate. These bile acids reflect what gut bacteria produce.

What you feed those microbes therefore shapes how this receptor functions. Long-fermented sourdough supports this process by delivering fibre in a form bacteria can use steadily.

This systems-based approach sits at the heart of The Sourdough School’s courses and research-led teaching.

TGR5 Receptor and Sourdough Bread

Sourdough bread also supports TGR5 signalling through its effect on bile acids and microbial metabolism. Long fermentation feeds gut bacteria in a steady way, rather than causing rapid sugar spikes.

Because of this, bacteria produce bile acids that activate TGR5 more consistently. When TGR5 activates, the body improves fat handling and energy use, especially in muscle and brown fat.

This mechanism links sourdough bread to metabolic health beyond digestion alone. It helps explain why traditionally fermented bread feels more sustaining and less disruptive to energy levels.

At The Sourdough School, this understanding informs both teaching and practice. Courses, workshops, and the Proven™ bread programme all focus on fermentation that supports metabolic signalling, not just flavour or texture.