Pineapple juice is healthy because it contains many important nutrients that the body requires on a daily basis. It is a good source of vitamin B1, dietary fiber, vitamin B6, panthothenic acid and folate, and has only 83 calories per serving.
Pineapples and pineapple juice are also high in vitamin C, which is a powerful antioxidant that destroys free radicals that attack and harm normal cells in the body. High amounts of vitamin C in a diet strengthen the immune system and helps dieters avoid sicknesses such as the cold, flu and ear infections. The excellent source of thiamin (vitamin B1) and manganese found in pineapple juice also assists the body in maintaining healthy energy levels.