Whether a person prefers tea or coffee may come down to their genes. Researchers have looked into how people perceive the bitter tastes of tea, coffee, and alcohol, and how this perception may affect their drink preferences. People with a version of a gene that increases sensitivity to the bitter flavor of caffeine tend to be coffee drinkers. Tea drinkers tended to be less sensitive to caffeine’s bitter taste but have versions of genes that increase sensitivity to the bitterness of other chemicals.

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