Kiwi watermelon juice will provide numerous health benefits when you combine kiwi fruit to the juice. Because you will receive additional amounts of vitamin A, vitamin C, vitamin E, potassium, magnesium and copper. A single kiwi fruit has only 42 calories and are very easy to add in your low-fat diet. Each kiwi has about 0.4 grams of fat and contains 2.1 grams of fibre. Watermelons will provide you with vitamin B6 which supports your immune system and is rich in antioxidant called lycopene.