Oranges are low in calories but full of nutrients. One medium orange provides 130 percent of your vitamin C needs for the day, and only 80 calories. They are rich in dietary fiber, and contain no saturated fats or cholesterol. Oranges are also rich source of potassium, which helps regulate blood pressure and maintain heartbeat regular.
According to American Heart Organization, eating citrus fruits in large amounts may lower the risk of ischemic stroke. As an excellent source of vitamin C, which is strong natural antioxidant, oranges help organism to fight free radicals known to cause cancer.