In January 2019 researchers from the USA published the results of their study to assess the effect of long-term intake of vegetables and fruits on cognitive function in later life. A total of 27,842 men, average age 51 years, were involved in the study. Information on average dietary intake was collected via 5 food frequency questionnaires which were completed every 4 years. The cognitive function score was assessed twice during the study using a 6-item questionnaire. Results showed that a higher intake of vegetables, fruit, and fruit juice were each significantly associated with a reduced risk of moderate or poor cognitive function. Daily consumption of orange juice was also associated with a reduced risk of poor cognitive function when compared to up to one serving per month. It was also seen that those who had a higher consumption of fruit and vegetables between the ages of 18-22 years also had a reduced risk of poor cognitive function.
Yuan C et al. Long-term intake of vegetables and fruits and subjective cognitive function in US men. Neurology. 2019 Jan 1;92(1):e63-e75