Abstract
The gut barrier is a sophisticated and dynamic system that forms the frontline defense between the external environment and the body's internal milieu and includes various structural and functional components engaged not only in digestion and nutrient absorption but also in immune regulation and overall health maintenance. When one or more components of the intestinal barrier lose their structure and escape their function, this may result in a leaky gut. Mounting evidence emphasizes the crucial role of the gut microbiome in preserving the integrity of the gut barrier and provides insights into the pathophysiological implications of conditions related to leaky gut in humans. Assessment of intestinal permeability has evolved from invasive techniques to noninvasive biomarkers, but challenges remain in achieving consensus about the best testing methods and their accuracy. Research on the modulation of gut permeability is just starting, and although no medical guidelines for the treatment of leaky gut syndrome are available, several treatment strategies are under investigation with promising results. This review discusses the composition of the intestinal barrier, the pathophysiology of the leaky gut and its implications on human health, the measurement of intestinal permeability, and the therapeutic strategies to restore gut barrier integrity.
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