New UCLA research suggests walnuts may improve memory

I would take this study with a heap of salt, for two reasons: A) it's a cross-sectional study, and the abstract doesn't mention that they controlled for any confounding variables (for example, people who eat more walnuts probably also exercise more and have more money/time to spend on things like healthcare), and B) the study was funded by the California Walnut Commission, which has a vested interest in promoting the health-benefits of walnuts.