Zonulin

Definition

Zonulin is a protein that regulates the opening and closing of tight junctions between intestinal cells. Elevated zonulin levels increase intestinal permeability and can compromise the intestinal barrier.

How it works

Zonulin acts as a gatekeeper, modulating the tight junctions that seal adjacent intestinal cells together. When zonulin levels rise excessively, it essentially 'opens the gates,' widening the spaces between cells and increasing intestinal permeability. This can occur in response to bacterial lipopolysaccharides (LPS), gluten exposure in susceptible individuals, and certain pathogenic bacteria. Elevated zonulin is associated with various inflammatory and autoimmune conditions, making it an important marker of intestinal barrier health.

Role

Regulates intestinal tight junction permeability and modulates the passage of substances across the intestinal barrier.

Examples

• Gluten-induced zonulin increase
• pathogenic E. coli triggering zonulin release
• elevated zonulin in celiac disease
• zonulin elevation from dysbiosis

Recommendations

Have zonulin levels tested if experiencing digestive issues or suspected barrier dysfunction. Avoid gluten if sensitive, and prioritize foods and supplements that strengthen tight junctions, such as bone broth, L-glutamine, and zinc-rich foods. Manage stress and maintain adequate sleep to support intestinal barrier function.

Key takeaway

Monitoring and controlling zonulin levels is essential for maintaining intestinal barrier integrity and preventing systemic inflammation.

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