According to the journal Appetite, they compare people that love black coffee and sadist or psychopathic tendencies.
More than 1,000 adults participated in the survey. The participants took personality tests assessing antisocial personality traits like sadism, narcissism and psychopathy.
The University of Innsbruck found that those who like bitter flavors were linked to psychopathic behavior.
Bitter flavors are related to “everyday sadism” AKA: enjoyment of inflicting pain on others.