They are dense in antioxidants, vitamins and nutrients, and are a storehouse of health benefits. From boosting healthy eyesight, regulating blood pressure, increasing blood flow to immunity, melons make for an extremely healthy addition to your diet. They are perhaps one of the oldest fruits known to mankind. Melons are not only low in calories and fat, but they are also high in essential vitamins and minerals, and water content. In fact, a fresh melon cantaloupe, and honeydew contains up to 90 percent water, making them some of the most thirst-quenching snacks around.