“A new study by University of Illinois researchers found that monounsaturated fatty acids – a class of nutrients found in olive oils, nuts and avocados – are linked to general intelligence, and that this relationship is driven by the correlation between MUFAs and the organization of the brain’s attention network.”
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Marta K. Zamroziewicz et al, Nutritional status, brain network organization, and general intelligence, NeuroImage (2017). DOI: 10.1016/j.neuroimage.2017.08.043