How to feed the brain is an ongoing mystery and omega-3 fatty acids are often mentioned as a possible brain aid. Now researchers have use the latest brain imaging, single photon emission computed tomography, or SPECT, to examine human subjects performing various cognitive tasks. These images were compared to the Omega-3 Index, which measures the blood concentration of two omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). The researchers found a significant association between higher brain blood flow and higher omega-3 based on the index. The researchers further found that omega-3 levels correlated with various psychological feelings using a standardized test battery (WebNeuro). It is important to note that these results show association, not causation. One researcher noted that while the study presents evidence that omega-3 levels are associated with better cardiovascular health, the role of the ‘fish oil’ fatty acids in mental health and brain physiology is just beginning to be explored.