The Claim
The prevalence of the BDNF Val66Met polymorphism, which reduces activity-dependent BDNF secretion, is approximately 50% in Japanese men and is associated with an inconsistent serum BDNF response to acute moderate exercise in this population.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
About half of Japanese men carry a genetic variant that reduces the release of BDNF during neural activity, and this variant is linked to variable changes in blood BDNF levels after moderate exercise.
See the scientific wording
The prevalence of the BDNF Val66Met polymorphism, which impairs activity-dependent BDNF secretion, is approximately 50% in Japanese men and may explain the inconsistent serum BDNF response to acute moderate exercise observed in this population.
A genetic variant in the BDNF gene prevents the protein from being properly packaged and released from brain cells during physical activity, so less BDNF enters the bloodstream after exercise.
What the research says
1 studyAbout half the Japanese men in the study didn’t have more BDNF in their blood after exercise, even though exercise usually raises it — and the claim says that’s because half of them have a gene variant that blocks BDNF release. The study didn’t test the gene, but the results match what the claim predicts.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.