Rounds of cognitive tests were done on 522 people in three groups, in a Spanish study over a 6½ year period. One group consumed a Mediterranean diet with extra-virgin olive oil, another ate a Mediterranean diet supplemented with mixed nuts, and the control group was assigned a low-fat diet.
The results? On average, those consuming either version of the Mediterranean diet scored significantly higher than the low-fat dieters on cognitive tests.
Interesting, but more study still needs to be done.

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