Lipopolysaccharides (LPS): Endotoxins, Leaky Gut & Metabolic Inflammation

Lipopolysaccharides are structural components of the outer membrane of gram-negative bacteria. In the gut, they're contained and relatively harmless. But when intestinal permeability increases (due to poor diet, alcohol, stress, or dysbiosis), LPS can translocate into the bloodstream — a process called metabolic endotoxemia — triggering systemic inflammation through Toll-like receptor 4 (TLR4) activation.

Why This Matters

Low-grade chronic elevation of circulating LPS has been associated with insulin resistance, obesity, fatty liver disease, and cardiovascular risk. High-fat meals (particularly those high in saturated fat and low in fiber) can acutely increase LPS translocation, a phenomenon called postprandial endotoxemia.

Reducing LPS Burden

Strategies to reduce LPS translocation focus on strengthening the gut barrier: adequate butyrate production (via prebiotic fiber and resistant starch), supporting Akkermansia populations (which maintain the mucus layer), reducing excessive alcohol, and consuming polyphenols that support gut integrity.

The omega-6 page discusses the inflammatory context that LPS-driven inflammation can exacerbate.