The name may have given it away but watermelon consists mostly of water – 92 percent. A study says that the mixture of salts, minerals and natural sugars in this juicy fruit can even hydrate your body better than water itself. Watermelon is also high in calcium, magnesium and potassium. It also has a lot of lycopene, which is a powerful antioxidant known to prevent cells from damage. Two cups of watermelon also has so much Vitamin C, almost half of the recommended daily value. You can mix watermelon slices with feta cheese for extra flavor.