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Here’s another good reason to eat your veggies: They may help prevent cognitive decline, according to a 2021 study out of Harvard University. Published in the journal Neurology, the study looked at the health data and self-reported dietary information of more than 77,000 men and women in the U.S. over a 20-year period. Average age at the start of the period was 51 for men and 48 for women.