Five possible health benefits of pineapple juice Benefits Here are a number of possible health benefits from drinking pineapple juice in moderation: 1. Boosting the immune system [toddler drinking a glass of fruit juice] Drinking pineapple juice may boost the immune system and shorten recovery time from illnesses. In one study conducted in the Philippines, researchers examined the effects of pineapple in school-aged children. Those who were given canned pineapple daily developed fewer viral and bacterial infections than those who did not eat canned pineapple. Their recovery time from these illnesses was also shortened. 2. Digestion Bromelain is an enzyme contained in the pineapple stem and juice that helps to break down and digest proteins. Bromelain in capsule form has also been shown to reduce swelling, bruising, healing time, and pain after surgery. Consuming pineapple and pineapple juice will not provide enough bromelain to be used as medical trea...