When You Eat Pineapple, Its Enzymes Break Down Proteins on Your Tongue
That slight tingling feeling from fresh pineapple happens because an enzyme called bromelain starts digesting proteins on your tongue.
Why / How?
Bromelain is so effective at breaking down proteins that it's sold as a meat tenderizer. Your saliva quickly washes it away and stomach acid neutralizes it—leaving no lasting harm, just a tangy tingle.