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Caffeine ingested under natural conditions does not alter taste intensity.

¹Monell Chemical Senses Center, Philadelphia, PA 19104.

Pharmacology, Biochemistry, and Behavior

|November 1, 1989

Summary

Caffeine (CAF) ingestion does not alter taste perception. This study found that consuming caffeine did not change how intensely people perceived various tastes, even when solutions contained low caffeine levels.

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Area of Science:

Sensory science
Neuroscience
Pharmacology

Background:

Previous research suggested topical caffeine enhances taste intensity.
The effect of ingested caffeine on taste perception remained unclear.

Purpose of the Study:

To investigate the impact of oral caffeine ingestion on perceived taste intensity.
To determine if saliva caffeine levels influence taste perception.

Main Methods:

Participants ingested caffeine (5.5 mg/kg) or placebo.
Salivary caffeine levels were measured.
Subjects rated the intensity of various taste and odor stimuli prepared in water or low-caffeine solutions.

Main Results:

Oral caffeine ingestion led to measurable salivary caffeine levels.

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No significant differences in perceived taste intensity were observed between caffeine and placebo conditions.

The medium used for taste solutions (water vs. low-caffeine) did not affect intensity ratings.

Conclusions:

Ingested caffeine does not significantly alter perceived taste intensity under typical consumption conditions.
Lingual adaptation to low micromolar caffeine levels in saliva does not enhance taste perception.