Supertasters

The compound 6-n-propylthiouracil (also known as PROP) elicits three different reactions in people: no flavor, unpleasantness, or intense bitterness.  Those in the "intense bitterness" category are labeled supertasters and are quite sensitive to certain foods.  In fact, they "taste" differently than the majority of the population.  For example, coffee and hoppy beer might also be quite bitter.  Scientists have linked this supertasting ability to the gene TAS2R28, a taste receptor protein found in our cells.

Read more!   http://science.howstuffworks.com/environmental/life/human-biology/taste4.htm