Cranberries are native to North America and are widely grown in the region today. In North American countries, cranberries are used as cranberry sauce, cranberry drink and dried cranberries. This fruit is very low in calories but rich in vitamins C, A and K. Cranberry is a very healthy fruit because it is rich in nutrients and antioxidants. Its properties include preventing various cancers, improving the immune system and lowering blood pressure. Native Americans have used cranberries in the past to treat kidney and bladder disease.