What is the possible reason that some foods promote the brain performance? [orig

Why certain food choices might help the brain function better remains unclear. Perhaps these regimens’ known cardiovascular benefits, which promote a good flow of blood and oxygen to the brain, are key. But other factors may be at work. Of course, questions about when these dietary changes need to happen or how diet stacks up against other factors, such as physical activity, sleep patterns and genetics also remain unanswered.