Loaded with proanthocyanidins (a type of antioxidant-rich, free-radical-fighting flavanoid), a daily dose of this crimson-red berry can help fight off urinary tract infections and other bacterial diseases. Cranberry consumption should not be relegated to the annual Thanksgiving dinner. Besides the benefits for the blood provided by antioxidant-packed cranberries, these tart berries are excellent for the mouth. We're not just referring to taste, though they are delicious. Cranberries have been shown to prevent cavities and gum disease.