Eating leafy greens, dark orange or red vegetables and berry fruits, and drinking orange juice may lower risk of memory loss over time, especially in men, a study has found.The study, published in the journal Neurology, looked at 27,842 men with an average age of 51 who were all health professionals.Participants filled out questionnaires about how many servings of fruits, vegetables and other foods they had each day at the beginning of the study and then every four years for 20 years.A serving of fruit is considered one cup of fruit or half a cup of fruit juice. A serving of vegetables is considered one cup of raw vegetables or two cups of leafy greens.“One of the most important factors in this study is that we were able to research and track such a large group of men over a 20-year period, allowing for very telling results,” said Changzheng Yuan, from Harvard TH Chan School of Public Health in the US.“Our studies provide further evidence dietary choices can be important to maintain your brain health,” said Yuan.Participants also took subjective tests of their thinking and memory skills at least four years before the end of the study, when they were an average age of 73.The test is designed to detect changes that people can notice in how well they are remembering things before those changes would be detected by objective cognitive tests.Changes in memory reported by the participants would be considered precursors to mild .