Evidence check: BDNF in the context of Darmgesundheit

BDNF (Brain-Derived Neurotrophic Factor) is primarily known for its role in neuronal plasticity and survival. In the context of gut health, BDNF is increasingly discussed within the gut-brain axis. Some research suggests that gut microbiota can influence BDNF expression – for example, through short-chain fatty acid production or vagus nerve modulation. However, the evidence remains largely mechanistic, coming mostly from animal models or small human studies. A direct, clinically meaningful link between specific gut microbiome profiles and BDNF levels in humans is not well established. Commercial tests that claim to assess gut health via BDNF should be viewed with caution. They are not diagnostic and may overstate the evidence. For improving gut health, focus on established strategies: a high-fiber diet, regular physical activity, and medical guidance when needed.