Eating pineapple with salt is to denature and inactivate the bromelain enzyme in pineapple to avoid discomfort. There is a substance in pineapple called pineapple prionase, which is a protein that can act as a catalytic enzyme to break down proteins in food and turn them into short-chain peptides, amino acids, etc., so that they can be digested and absorbed more easily. However, since part of the oral mucosa itself is protein, when pineapple prion enzyme enters the mouth, it may damage the oral mucosa, thus making people feel numbness in the mouth and mouth pain after eating pineapple. At the same time, because the pineapple prion enzyme is a kind of macromolecular protein with allergenicity, it is easy to trigger allergic symptoms, such as hives, for people with allergies, and some of them also have edema of the limbs, edema of the larynx, and respiratory difficulties. The high concentration of salt water can make protein denaturation, protein denaturation will lose its activity, thus inhibiting the side effects of pineapple prion enzyme, so you can eat pineapple with the right amount of salt.