Spinach and kale have been touted for years as superfoods. They are low in calories and loaded with antioxidants, anti-inflammatory compounds, iron, and vitamins K, A, and B6.
All of these are great for your heart and overall health and fitness.
But researchers have found that the greatest benefits of these leafy greens might be keeping your brain sharp.
Both vegetables are rich in a relatively obscure nutrient called lutein.