We review the research ” Study links nutrition to brain health and intelligence in older adults ” in regard to maintaining crystallized intelligence ” – the ability to use the skills and knowledge one has acquired over a lifetime”. Citation: Parahippocampal Cortex Mediates the Relationship between Lutein and Crystallized Intelligence in Healthy, Older Adults. Frontiers in Aging Neuroscience, 2016; 8 DOI: 10.3389/fnagi.2016.00297