Sweet as Salt .. duh!!
Salty and sweet are distinct tastes which our taste buds are able to detect. But add some salt to pineapple and youll notice something strange -- it doesnt taste salty at all. In fact, the pineapple seems to taste sweeter when the salt is added than it does otherwise. Whats going on here? Just some neat kitchen chemistry.
Bitterness -- another taste we can pick up on -- and sweetness cancel each other out to some degree. One of the reasons it makes sense to add sugar to your coffee is because coffee naturally is bitter, and by doing so, you end up countering the bitterness more than anything else. And in this case, whats true for coffee is also true for pineapples. Kind of.
Pineapples are inherently sweet but also have some bitterness to them. If we can neutralize the bitterness, it would follow that the pineapple would taste sweeter. Salt does exactly this. Salt, as any 8th grade science student can tell you, is NaCl -- sodium chloride. And when it mixes with the pineapple, the salt splits up into sodium and chloride ions. The chloride is tasteless (and harmless in those amounts -- or, no more harmful than it would be as salt) and our tongues ignore it. The sodium, on the other hand, bonds with the acids in the pineapple and forms a similarly tasteless salt once again. In doing so, the acids in the pineapple disappear from our tastebuds, and the bitterness goes with them.
All thats left is the sweet-tasting sugars found in the fruit, and, with nothing to counteract that, these sugars take over. The salt doesnt make the pineapple sweeter -- at least not directly -- but simply less bitter. Our palates arent nuanced enough to detect the difference.