Raw pineapple contains a protease (enzyme that cuts proteins) that can "digest" the mouth lining. However, till you start feeling the unpleasant sensation there is no problem at all - the body can handle it. The trick is to stop in time. There is no way to know in advance when the stinging happens - it depends on you and also on the pineapple.<br>
We eat a whole pineapple almost every day. Some days I get a sting after a few slices, other days I can eat a whole one.<br><br>
If you have time you could give this a read:<br><a href="http://www.geocities.com/HotSprings/7627/ggraw_eat2.html" target="_blank">http://www.geocities.com/HotSprings/...graw_eat2.html</a><br><br>
A quote from part 2 (<a href="http://www.geocities.com/HotSprings/7627/ggraw_eat3.html" target="_blank">http://www.geocities.com/HotSprings/...graw_eat3.html</a>):<br><br>
"_I would now like to know why the pineapple suddenly turned prohibitively abrasive.<br><br>
o Pineapple contains an enzyme, bromelaine, that dissolves protein and corrodes mucus membranes in the mouth.<br><br>
_But how is it that you weren’t feeling anything unpleasant?<br><br>
o You didn’t either, until after a few mouthfuls. The body will only take pineapple so long as it can produce enzymes that neutralize bromelaine. After that, when the body draws the line, which you may realize when the taste of the fruit turns sharp_there are no buffer enzymes left in your saliva so that pineapple starts digesting your mouth."