Acid, not carbonation, is the source of soda's sharp taste, according to a study published in the journal PLOS One. The findings may create opportunities for beverage makers to adjust their formulas to appeal to people with a reduced sense of taste. "Flavor is a complex interaction between taste, smell, touch, pain, sound and visual aspects. If we can understand how those interact, we can tweak some of them to create a more desirable flavor profile," said Paul Wise, a psychologist who led the study.

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