Hmmmmm, not too sure about this, but it explains a few ex’s in the past.
Here is more from Vice:
According to the researchers, ‘The results suggest that how much people like bitter-tasting foods and drinks is stably tied to how dark their personality is.” These findings are the “first empirical evidence that bitter taste preferences are linked to malevolent personality traits.” Not one but two experiments proved this to be so.
In the first experiment, a group of 500 people were asked to rate how much they liked certain foods. These men and women, with an average age of 35, then completed four different personality questionnaires. The questionnaires tested levels of aggression, with “given enough provocation, I may hit someone”-type of questions. They examined personality traits (“I tend to be callous or insensitive”). They also classified the participants among the “Big Five” personality characteristics of extraversion, agreeableness, conscientiousness, and emotional stability. And the participants were given something called the Comprehensive Assessment of Sadistic Tendencies—yes, apparently there is such a test.
It turned out that people who said things like “I enjoy tormenting people” were the same people who really had a yen for radishes and tonic water. Anyone else getting the creeps? A second experiment confirmed the results of the first. In it, 450 people were tested.
The researchers explained in the journal Appetite, “General bitter taste preferences emerged as a robust predictor for Machiavellianism, psychopathy, narcissism and everyday sadism.”