Why does pineapple burn your tongue?
The Real Answer
Fresh pineapple can irritate or sting your mouth, but the simple idea that it is literally digesting your tongue is too dramatic. Bromelain can break down proteins, pineapple is acidic, and microscopic needle-like calcium oxalate crystals may also contribute to the prickly sensation; no single cause fully explains the feeling. Heating during cooking or canning reduces bromelain activity, which is one reason canned pineapple often feels less irritating.
You take one bite of fresh pineapple, feel your mouth start tingling, and keep eating because the bowl is already in front of you. By the fourth piece, your tongue is objecting and your hand is still reaching for another one.
The Dunce Dynamics Institute Examines Why People Ask This
The sting is easy to mistake for proof that pineapple is literally eating your mouth. The better answer is less cinematic: several features of fresh pineapple may contribute, and the exact mix is not fully settled.