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A recent study investigated how regular caffeine consumption affects human taste perception, specifically examining whether it influences sweet flavors similarly to adenosine receptors in rodents. Researchers had 107 participants sample decaffeinated coffee enhanced with either synthetic caffeine or an equibitter concentration of quinine across different sessions. The findings revealed that caffeine selectively reduced the perceived sweetness of both the coffee itself and subsequent sucrose solutions without altering sour, salty, bitter, or umami tastes. Additionally, participants could not reliably distinguish between caffeinated and noncaffeinated beverages or report differences in alertness and hunger, highlighting a strong psychological placebo effect linked to coffee consumption.
