A study about the frequency of taste disorders

Area of Science:

• Neuroscience
• Psychophysics
• Sensory Science

Background:

• Functional anosmia (smell loss) affects 5% of the population, but taste disorders are less understood.
• Previous taste function studies used limited tests, hindering interpretation.
• Investigating the prevalence and characteristics of gustatory dysfunction in a healthy population is crucial.

Purpose of the Study:

• To determine the frequency of hypogeusia and ageusia in a healthy population.
• To evaluate taste perception using validated psychophysical methods.
• To explore the relationship between age and taste function.

Main Methods:

• Utilized two psychophysical taste tests: validated taste strips and suprathreshold taste solutions.
• Assessed perception of four basic tastes: sweet, sour, salty, and bitter.
• Tested 761 healthy individuals aged 5–89 years, including self-reported taste function assessment.

Main Results:

• 5.3% of subjects scored below the threshold for hypogeusia using taste strips.
• 82.3% correctly identified all four basic taste solutions.
• A positive correlation was found between the two taste tests (r = 0.33, p < 0.001).
• A significant negative correlation existed between age and taste test performance.
• Complete ageusia was not observed; however, taste misinterpretations were frequent.

Conclusions:

• Hypogeusia affects approximately 5% of the healthy population, whereas complete ageusia is rare.
• Taste perception declines with increasing age.
• Misinterpretation of tastes is a common finding, highlighting the complexity of gustatory function assessment.