Mechanistic · Editorial synthesis
Routes of microbiota–gut–brain communication
Neural · Immune · Endocrine · Metabolic
Research
Bidirectional communication linking intestinal, neural, endocrine and immune systems.
Research library
Mechanistic · Editorial synthesis
Neural · Immune · Endocrine · Metabolic
Experimental animal model · Editorial synthesis
Models · Mechanism · Translation
Human observational · Longitudinal human protocol · Systematic review · Meta-analysis
Human studies · Translation · Clinical evidence
Experimental animal model · Human observational · Longitudinal human protocol · Systematic review · Meta-analysis · Editorial synthesis
Causality · Evidence · Translation
Perspective · Regulation · Aug 25, 2026
Health lies less in maintaining a fixed state than in a system’s capacity to regulate, adapt and recover. Intestinal permeability provides a biological starting point for asking when a response is appropriate—and when regulation becomes dysregulation.
Evidence interpretation · Zonulin · Aug 25, 2026
Zonulin provides a concrete example of a wider scientific problem: turning a dynamic regulatory mechanism into a simple linear disease model. Each step from pathway to measurement, permeability and pathology requires its own evidence.
Perspective · Living Boundaries · Aug 24, 2026
Living Boundaries concerns the health of communication: how a boundary receives, sets limits and adapts according to context. The intestinal barrier is the biological starting point for that larger question.