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

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.

In light of new evidence that happy people don’t live longer than their grumpy peers, one might be tempted to drop the pursuit altogether. A recent study published in the Lancet reported that while those who were happier tended to be healthier, they had no edge when it came to longevity. On the other hand, evidence shows that attitude can have meaningful effects on health, even if it can’t outright extend one’s life.