A few weeks ago, a scientific claim linking canola oil to Alzheimer's disease risk raised an intriguing question: When it comes to healthy eating, do we have to choose between the head and the heart? In other words, is it possible that foods promoted as good for cardiovascular health, such as canola oil, are bad for the brain?

There's surprisingly little information out there on what to eat for brain health. The vast majority of nutrition research is aimed at the heart. Why wouldn't scientists want to focus on maintaining the seat of consciousness, memory, creativity, love, learning and joy, as opposed to a glorified pump?

Sure, heart disease is the leading cause of death in the United States. But disorders of the brain may cause more suffering, and the numbers are growing. According to a new report, more than 6 million Americans currently live with Alzheimer's disease, and by 2060, that will rise to 15 million. Given the choice, I'd much rather live with a faltering heart and a mint-condition brain than the other way around.