What to watch with BDNF and gut health?

BDNF (Brain-Derived Neurotrophic Factor) is crucial for neuroplasticity and is also expressed in the gut. The gut-brain axis links the microbiome to brain function; some bacteria can modulate BDNF expression. The common rs6265 (Val66Met) variant, carried by ~20% of Europeans, affects BDNF secretion. Met carriers may be more responsive to dietary interventions like omega-3s or probiotics that boost BDNF. However, evidence is moderate—mostly from animal models and small human studies. No firm clinical guidelines exist. To support BDNF via gut health, focus on fiber-rich, fermented foods and stress management. A DNA test alone is not predictive; the interaction is complex. Beware of exaggerated marketing claims.