Watermelons can really be great because of its high water content so no sugar excess for this one. It is also reported to contain lycopene (the one rich nutrient of tomatoes) and helps your skin look radiant. It fights against skin cancer, as well. Citrulline, an amino acid in watermelon juice, provides better circulation and lessens swelling or soreness after strenuous physical activities. Studies have shown that watermelon can fight off kidney complications too.