A half-cup serving of pineapple juice provides 60 calories and is a source of vitamin C, magnesium, potassium and calcium. Pineapple is the only known natural source of bromelain, an enzyme with antioxidant properties that may help individuals suffering from inflammatory bowel disease and could prevent colon cancer. Fresh pineapple and juice are the best sources of bromelain.
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Pineapple juice can come straight from the pineapple or may be made from previously concentrated juice. Enzymes in pineapple juice help to dissolve mucous. Health professionals at the UNC Lineberger Cancer Center suggest drinking a glass of pineapple juice before meals to help break up thick mucous if you are dealing with decreased saliva production.
Water and Other Fruit Juices
Pineapple juice may contain water if it was previously concentrated. Other juices, like orange, grapefruit or cranberry, may be mixed with the pineapple juice to provide additional flavor and variety.
Ascorbic Acid and Sugar
Some pineapple juice has added ascorbic acid, which increases vitamin C content. Sweeteners such as sugar or corn syrup may be added to the juice. Check the label if you are looking for unsweetened pineapple juice with no additional sugar.