Keeping many spinachs washed with orange juice, they say they help the risk of early memory by humans.
Those mocking the green leaves that gave a caricant sailor, Popeye's oversight saw a fall of up to 34 percent, a study revealed.
Drinking orange also defended "poor thinking skills", reducing a risk of up to 49 percent, a survey of 28,000 men over 20 years by the American University of Harvard found.
Further researcher Dr. Changzheng Yuan said: "Our studies provide more obvious dietary choices can be important to support brain.
"One of the most important factors in this study is that we have been able to explore and track such a large group of people over 20 years."
Participants ate various amounts of green leaves such as spinach, or red and orange glass and fruit.
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Veg grew a memorable power, but men who ate the most fruits saw only a small protection effect.
The best results were for six daily services.
Serving was half a cup of juice, two cups of leaf green and one cup of crude veg or fruit.
While the vegetation increased memory power, men who ate the most fruit every day only saw a small protection effect.