Mixed
Gut microbiota composition and activity directly influence central nervous system function, behavior, and stress responsiveness through bidirectional signaling via neural, endocrine, and immune pathways.
Your gut health is connected to your brain health through multiple biological pathways (nerves, hormones, immune system). While you can't just take a probiotic to cure depression or anxiety, maintaining a diverse microbiome through a fiber-rich diet may support overall brain and gut function. Be skeptical of claims that a specific probiotic will fix mental health issues, as human results are inconsistent. Focus on long-term dietary patterns rather than quick fixes.
Preclinical and clinical studies have shown bidirectional interactions within the brain-gut-microbiome axis. Gut microbes communicate to the central nervous system through at least 3 parallel and interacting channels involving nervous, endocrine, and immune signaling mechanisms.
Why this rating
Strong preclinical evidence (animal models) but limited and inconsistent clinical evidence in humans.
Source
The Brain-Gut-Microbiome Axis
Clair R. Martin et al. · Cellular and Molecular Gastroenterology and Hepatology · 2018
DOI 10.1016/j.jcmgh.2018.04.003
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This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →