Kale’s health benefits are primarily linked to the high concentration and excellent source of antioxidant vitamins A, C, and K — and sulphur-containing phytonutrients.
Carotenoids and flavonoids are the specific types of antioxidants associated with many of the anti-cancer health benefits. Kale is also rich in the eye-health promoting lutein and zeaxanthin compounds.
Beyond antioxidants, the fiber content of cruciferous kale binds bile acids and helps lower blood cholesterol levels and reduce the risk of heart disease, especially when kale is cooked instead of raw.
1. Kale is low in calorie, high in fiber and has zero fat. One cup of kale contains 36 calories, 5 grams of fiber, and 15% of the daily requirement of calcium and vitamin B6 (pyridoxine), 40% of magnesium, 180% of vitamin A, 200% of vitamin C, and 1,020% of vitamin K. It is also a good source of minerals copper, potassium, iron, manganese, and phosphorus.
2. Kale is high in iron. Per calorie, kale has more iron than beef. Iron is essential for good health, such as the formation of hemoglobin and enzymes, transporting oxygen to various parts of the body, cell growth, proper liver function and more.
3. Kale is high in Vitamin K. Eating a diet high in Vitamin K can help protect against various cancers. It is also necessary for a wide variety of bodily functions including normal bone health and the prevention of blood clotting. Also increased levels of vitamin K can help people suffering from Alzheimer’s disease.
4. Kale is filled with powerful antioxidants. Antioxidants, such as carotenoids and flavonoids help protect against various cancers.
5. Kale is a great anti-inflammatory food. One cup of kale is filled with 10% of the RDA of omega-3 fatty acids, which help, fight against arthritis, asthma and autoimmune disorders.
6. Kale is great for cardiovascular support. Eating more kale can help lower cholesterol levels.
7. Kale is high in Vitamin A.Vitamin A is great for your vision, your skin as well as helping to prevent lung and oral cavity cancers.
8. Kale is high in Vitamin C. This is very helpful for your immune system, your metabolism and your hydration.
9. Kale is high in calcium. Per calorie, kale has more calcium than milk, which aids in preventing bone loss, preventing osteoporosis and maintaining a healthy metabolism. Vitamin C is also helpful to maintain cartilage and joint flexibility
10. Kale is a great detox food. Kale is filled with fiber and sulfur, both great for detoxifying your body and keeping your liver healthy.
Sources
http://www.mindbodygreen.com/0-4408/Top-10-Health-Benefits-of-Eating-Kale.html
http://www.webmd.com/food-recipes/features/the-truth-about-kale

