How are Leaky Gut Test and Müdigkeit related?

The relationship between a leaky gut test and fatigue is not scientifically well-established. Leaky gut tests (e.g., measuring zonulin in stool) are marketed as indicators of increased intestinal permeability, but clinical validation is largely lacking. Fatigue has many causes—from sleep deprivation and nutrient deficiencies to chronic inflammation. A positive leaky gut test could theoretically point to a compromised barrier that promotes systemic inflammation, which might contribute to fatigue. However, no robust human studies confirm this link. The evidence is mostly mechanistic or based on animal models. Moreover, commercial leaky gut tests are often not standardized and are criticized by medical societies. Anyone suffering from persistent fatigue should pursue a comprehensive medical evaluation rather than rely on a single test. The provided context contains no specific sources on this topic.