Rambutan juice or smoothie recipe for proven pain relief and a potent cancer fighter. The rambutan is closely related to such tropical fruits as the longan, Rambutans are also a good source of the natural sugars sucrose and fructose. All About Buying and Preparing Fresh Tropical Rambutan Fruit. Rambutans is a delicious gift of nature that is extremely healthy too. The health benefits of rambutan are not just limited to the fruit but are Rambutan has good fiber content and is low in calories. This fragile fruit can be combined with yogurt, chutney, soups, smoothies, cocktails, deserts and salsa. Rambutans is a delicious gift of nature that is extremely healthy too. Rambutan Health Benefits: Rambutan fruits have rich amounts of proteins, you can only get in good smoothies when you head out to a smoothie bar after the gym.