Supertasters are people who experience taste with far greater intensity over the average. It is estimated that about 25% of the population are supertasters and women are more likely to be supertasters than men as are Asians and Africans. The cause of this heightened response is thought to be due to an increased number of fungiform papillae or taste buds. Although one would think that the taste sensation would be an advantage if it is more sensitive, this is not always the case. An increased response to bitterness may severely limit the range of foods that are palatable. Vegetables have important phytochemicals that are protective of heart disease and cancer risk but their natural bitterness may turn supertasters off.

A potential unintended consequence of population-wide salt reduction has been highlighted in a paper by John Hayes and colleagues from Pennsylvania State University, published in the latest edition of Physiology and Behavior .

Hayes and colleagues examined the response of supertasters to varying amounts of salt in a wide range of foods. As indicated previously, these supertasters make up about 25% of the population and are genetically hypersensitive to bitter tastes, leading them to naturally avoid some vegetables and other foods that taste naturally bitter.

The researchers measured the liking and intake of foods with varying amount of saltiness among 87 healthy adults (45 men).

Supertasters reported greater saltiness in chips and pretzels and soup broth at levels comparable to regular-sodium products. They also found greater sensory enjoyment to growing salt concentration in cheeses (where sodium ions mask bitterness).

Despite adding less salt, supertasters consumed more sodium through food, as salt was more important to preference, both for its salty taste and masking of bitterness. This suggested to the researchers that supertasters appreciate increased salt in food formulations to mask naturally bitter foods particularly vegetables and other foods that may be deemed to be healthy.