This leafy vegetable protects the body against cancer risk due to ‘glucosinolates’ found in the greens that help support the body’s detox and anti-inflammatory systems. This food is a rich source of Vitamin K and a good source of Vitamin A, C, manganese, and fiber. Do not overcook. Overcooked collard greens emit an unpleasant sulfur smell. Steam for no more than 5 minutes.