Evidence check: Leaky Gut Test in the context of Schlaf

The 'leaky gut' concept remains scientifically controversial. No consumer home tests for intestinal permeability have been clinically validated for diagnosis. Claims that a leaky gut test can explain sleep disturbances lack robust evidence. While the gut–sleep axis is an active research area, it is complex and not captured by simple DNA or stool tests marketed directly to consumers. Most commercial leaky gut tests measure surrogate markers (e.g., zonulin, antibodies) whose individual predictive value is uncertain. Increased intestinal permeability is observed in certain diseases (celiac, Crohn's), but a direct causal link to poor sleep in otherwise healthy individuals is unproven. Without clinical symptoms and medical workup, test results should not guide sleep interventions. Evidence: unclear. Sources: none specific in context.