What to watch with Kefir Darm and Schlaf?

The combination of kefir (gut health) and sleep is intriguing but not yet strongly evidence-based. Kefir contains probiotics that may modulate the gut microbiome, and via the gut-brain axis, a healthy microbiome could influence sleep through neurotransmitters like serotonin or GABA. However, most evidence comes from animal models or small human trials; large RCTs are lacking. MyBody-X offers microbiome and hormone tests, including cortisol measurement (see article on home cortisol testing). Disrupted cortisol rhythms are linked to poor sleep. Still, a microbiome test alone cannot diagnose sleep disorders. Consumers should be aware of individual tolerances (e.g., histamine intolerance with kefir). Evidence: mechanistic, based on plausible biological pathways but without robust clinical confirmation. No specific studies from the provided context.