Dark-green leafy vegetables, including kale, collards, and arugula, are packed with the antioxidant lutein. A major carotenoid, lutein is concentrated in our brain and our eyes. The retina, the back of our eyeball, is an extension of our central nervous system—an outpouching of the brain during development—and there is a spot right in the middle. That is what the doctor sees when they look into your eye with that bright light. That spot, called the macula, is our HD camera, where we get the highest resolution vision, and it’s packed with lutein. Levels of lutein in the retina correspond to levels in the rest of our brain, so our eyes can be a window into our mind. Significant correlations exist between cognitive test scores and the amount of macular pigment in our eyes—plant pigments like lutein. Increasing our intake of greens, such as kale, can be a beneficial way to improve and maintain the health of our brain and eyes. The egg industry likes to boast about how much of these pigme...