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 contain this carotenoid nutrient. Among the carotenoids, lutein is perhaps best known for its supportive role in eye health, and in particular, for its ability to protect different parts of the eye from potential damage by light or oxygen. A recent study on African-American women has shown decreased likelihood of glaucoma (an eye problem usually caused by increased pressure within the eye) when dietary intake of kale reaches higher intake levels. In this case, "higher intake levels" were defined as any levels exceeding at least one half-cup serving per week. Since our WHFoods serving size for kale is one cup, you will be getting more than this amount from one serving based on our standard. Among all of the vegetables examined in this particular study, kale and collards came out at the top of the vegetable list in this study for decreasing the likelihood of glaucoma!