Leaky gut — more accurately termed increased intestinal permeability — is now implicated in everything from autoimmune diseases to depression. But there remains considerable confusion about the actual causes of leaky gut and how to effectively address it.

Leaky gut — more accurately termed increased intestinal permeability — is now implicated in everything from autoimmune diseases to depression. But there remains considerable confusion about the actual causes of leaky gut and how to effectively address it.

The Anatomy of the Gut Barrier

Intestinal epithelial cells are joined together by tight junction proteins, which regulate which substances can pass from the gut into the bloodstream. Tight junctions function like gatekeepers, controlling nutrient absorption while blocking harmful substances.

When these tight junctions are compromised, increased permeability occurs. Potentially irritating substances like lipopolysaccharide (LPS, cell wall components of Gram-negative bacteria), undigested food proteins, and pathogens can cross the gut barrier into the bloodstream, where they trigger immune responses.

How Inflammation Worsens Leaky Gut

This is the critical connection: leaky gut drives systemic inflammation, but systemic inflammation also worsens leaky gut. Inflammatory cytokines such as TNF-alpha and IL-1 beta directly regulate tight junction protein expression and function.

This creates a positive feedback loop: leaky gut causes inflammation, inflammation worsens leaky gut. Breaking this cycle requires addressing both problems simultaneously — repairing the gut barrier and reducing systemic inflammation.

Lipopolysaccharide and Metabolic Endotoxemia

High-fat diets have been shown to increase intestinal permeability and circulating LPS levels, a condition termed metabolic endotoxemia. LPS is associated with immune cell activation in adipose tissue, driving systemic low-grade inflammation that is characteristic of metabolic syndrome.

This is a diet-gut-inflammation axis where the gut is the central junction. Dietary choices that modify gut permeability can have profound effects on systemic inflammation levels.

Supporting Gut Barrier Repair

Glutamine is the most important fuel source for intestinal epithelial cells and has been shown to support gut barrier function. Zinc plays a role in tight junction protein synthesis and has shown improvements in gut permeability in people with leaky gut syndrome.

VisiFlora’s formulation targets the gut-brain axis, supporting both overall gut barrier function and microbiome balance. This approach is better suited to long-term resolution of the leaky gut and inflammation cycle.