Omega-3 is widely considered one of the most beneficial supplements for brain health; however, a new study challenges this established view. According to scientists, omega-3 intake in older age may be associated with accelerated cognitive decline, which is explained by specific mechanisms of brain function.
Brain scans conducted as part of the study showed a significant drop in glucose metabolism, which researchers link specifically to the consumption of omega-3 supplements. A decrease in glucose metabolism is typically associated with synaptic dysfunction. This means that regardless of whether the physical structure of the brain is preserved, communication and information exchange between brain cells become less effective.
As the study’s authors note in their paper, the omega-3-related cognitive decline in the elderly is likely caused precisely by this negative impact on synaptic function. The scientists emphasize that this process is not related to the classic proteinopathies (the accumulation of pathological proteins in the brain) characteristic of Alzheimer’s disease.
A young brain possesses an enormous energy reserve and neuroplasticity, allowing it to easily and imperceptibly compensate for minor drops in glucose metabolism. In older age, however, the brain’s energy resources and synaptic flexibility are naturally diminished; thus, any additional decline in metabolism caused by Omega-3 intake becomes critical. Deprived of energy and being less flexible, the aging brain can no longer replenish this deficit, which ultimately manifests as a breakdown in intercellular communication and cognitive decline.
At the same time, the research team explains that their findings do not provide a basis for a definitive conclusion at this stage. The work performed is not a clinical trial but an observational study, which revealed only a correlation rather than a firm cause-and-effect relationship. Consequently, the issue requires further investigation to confirm this link.
Nevertheless, the results significantly alter the general perception of omega-3 as an unequivocally beneficial supplement. Researchers urge the medical community to approach the matter with greater caution and to re-evaluate the practice of widespread use of this supplement for cognitive protection.
