Evidence check: BDNF in the context of weight loss

BDNF (Brain-Derived Neurotrophic Factor) is often discussed in weight loss contexts due to its role in hypothalamic appetite regulation. Some GWAS have linked BDNF variants (e.g., rs6265) to BMI and obesity risk, but effect sizes are small and lifestyle factors dominate. Consumer DNA tests may overstate the impact. Current evidence is human-moderate: associations exist but are not strong enough for personalized weight loss recommendations. A direct blood test for BDNF levels is more actionable than a single SNP. Always interpret with caution and consult a professional.