Kale has long been touted as one of the most nutritious vegetables around. It is very high in vitamin C, vitamin K, vitamin A, copper, and manganese. It also contains high amounts of beta-carotene, lutein, and zeaxanthin, which are all phytonutrients important for maintaining healthy vision. Indoles and sulforaphane are also found in kale, and are believed to have powerful anti-cancer properties. (Read more about kale on World's Healthiest Foods and get your nutrition facts on Self.com.)