Myths vs facts: BDNF and Darmgesundheit

BDNF (Brain-Derived Neurotrophic Factor) is crucial for neuroplasticity and cognition. Gut health influences BDNF via the microbiota-gut-brain axis: certain bacteria (e.g., Lactobacillus, Bifidobacterium) may upregulate BDNF, while inflammation or dysbiosis can reduce it. However, evidence is largely mechanistic or from animal models; human data are limited and often correlational. Marketing claims that a specific probiotic or gut cleanse will significantly boost BDNF are not supported by robust clinical trials. Fact: a high-fiber, anti-inflammatory diet supports both gut microbiome and BDNF, but individual responses vary. DNA tests for BDNF variants (e.g., Val66Met) offer only weak risk information, not actionable guidance. Evidence: mechanistic, animal, few human studies. Safety note: Do not take supplements without medical supervision.