Spinach and kale are favorites of those looking to stay physically fit, but they also could keep consumers cognitively fit because of lutein, a nutrient found in green leafy vegetables, according to a new study from University of Illinois researchers.

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Spinach and kale are favorites of those looking to stay physically fit, but they also could keep consumers cognitively fit because of lutein, a nutrient found in green leafy vegetables, according to a new study from University of Illinois researchers.