In the study, 500 participants ranked their taste preferences for salty, sweet, sour, and bitter foods. They then were asked to take a series of personality quizzes. It was discovered that those who rated bitter foods highest were more likely to show traits of psychopathy, sadism, and aggression. A second study that surveyed another group of similar size unearthed a fourth trait connected to a love of hoppy beer and dark roasted coffee: narcissism.
“Taken together, the results suggest that how much people like bitter-tasting foods and drinks is tied to how dark their personality is,” the study authors wrote.
The researchers also pointed out that what makes a person like a specific food is a “complex knot” of biology and sensitivity to taste and odor. Even though the study points to a correlation between bitter foods and dark personalities, the study was still fairly inconclusive, and more research is needed.