Fruits that are low in calories, high fiber and juicy are the best ones for those who want to lose weight. Fruits such as apples, berries, avocados, grapefruits and oranges are considered as the best weight loss fruits. Along with these melons, papaya, kiwi and bananas are also considered as helpful fruits if you consume the right amount of them. They fulfill all of the essential needs of the human body and burn fat as they enhance metabolism organically.