9. Brain health
Kale contains a generous amount of iron, which is needed for the formation of hemoglobin. Hemoglobin in turn is the main carrier of oxygen to cells and is also important for muscle and brain health.
Another aspect of this benefit is that the brain is about 60 % fat and people need more omega 3 fats in their diet to boost brain health. Kale in an excellent source of plant based omega 3s, which have been linked to improved cognitive functioning.