Ageusia

Ageusia is the loss of taste functions of the tongue, particularly the inability to detect sweetness, sourness, bitterness, saltiness, and umami (meaning "pleasant/savory taste"). It is sometimes confused with anosmia – a loss of the sense of smell. Because the tongue can only feel texture and differentiate between sweet, sour, bitter, salty, and umami, most of what we think of as the sense of taste actually comes from smell. Ageusia is a lot rarer than hypogeusia – a partial loss of taste – and dysgeusia – a distortion or change of taste.^[1][2]

1. ↑ "Taste Disorders". Massachusetts Eye and Ear Infirmary. Retrieved 30 November 2018.
2. ↑ Hummel T, Landis BN, Hüttenbrink KB (2011). "Smell and taste disorders". GMS Current Topics in Otorhinolaryngology, Head and Neck Surgery. 10: Doc04. doi:10.3205/cto000077. PMC 3341581. PMID 22558054.