According to the American Heart Association, eating higher amounts of a compound found in citrus fruits such as oranges and grapefruit may lower the risk of ischemic stroke for women. Those who ate the highest amounts of citrus had a 19 per cent lower risk of ischemic stroke than women who consumed the least. As an excellent source of the strong antioxidant vitamin C, oranges can also help to combat the formation of free radicals that cause cancer. While an adequate vitamin C intake is necessary and very beneficial as an antioxidant, the amount necessary for therapeutic purposes for cancer is more than we can consume. Also, the fibre, potassium, vitamin C and choline content in oranges all support heart health.