Black coffee drinkers are more likely to be psychopaths according to a new study by scientific journal Appetite.
Dr Sagliogou of Innsbruck University, tested 500 men and women, who were asked to rate a list of sweet, salty, bitter and sour foods - while also answering personality tests.
The report revealed: "General bitter taste preferences emerged as a robust predictor for Machiavellianism, psychopathy, narcissism and everyday sadism."
According to the Metro newspaper, the scientist also found those who like the taste of bitter foods are more likely to take part in fear-inducing tasks, including riding roller coasters.
He added: "We found particularly robust correlations with everyday sadism, which is a construct related to benign masochism - the enjoyment of painful activities."