Is BDNF useful for weight loss?

BDNF (Brain-Derived Neurotrophic Factor) is primarily known for its role in neuroplasticity and cognitive function. Some mechanistic and animal studies suggest a link to energy homeostasis: BDNF may regulate appetite and energy expenditure via hypothalamic pathways. However, the evidence for a direct, clinically meaningful effect on weight loss in humans is weak. No robust randomized controlled trials demonstrate that BDNF supplementation or genetic variants (e.g., Val66Met) lead to significant weight reduction. Furthermore, circulating BDNF levels are influenced by exercise, stress, and sleep, making interpretation difficult. A DNA test for BDNF variants does not provide actionable guidance for weight loss. Established strategies—caloric deficit, physical activity, and behavioral change—remain the cornerstone. The evidence grade is mechanistic/unclear.