I've heard that kale is super concentrated in lutein. What's the benefit of this phytonutrient?

Among all 100 of our WHFoods, kale tops the list in terms of lutein content. Kale is not only our most lutein-rich food at WHFoods, it is also the top lutein-containing food in the USDA's National Nutrient Database that analyzes 5,350 foods that ...

from The World's Healthiest Foods http://ift.tt/2qA4qEp