Kale can be curly or flat or even have a bluish tint mixed in with the green. The flavors differ, so try them all.  Minerals including phosphorus, potassium, calcium, and zinc,  Lutein and zeaxanthin, nutrients that give kale its deep, dark green color and protect against macular degeneration and cataracts,  Vitamin A (important for eye and bone health and a strong immune system), vitamin C (aids in cold and chronic disease prevention), and vitamin K (good for blood clotting and bone building)