What makes someone go from simply being hungry to full-on “hangry?” More than just a simple drop in blood sugar, this combination of hunger and anger may be a complicated emotional response involving an interplay of biology, personality and environmental cues, according to research published by the American Psychological Association.

“We all know that hunger can sometimes affect our emotions and perceptions of the world around us, but it’s only recently that the expression hangry, meaning bad-tempered or irritable because of hunger, was accepted by the Oxford Dictionary,” said lead author Jennifer MacCormack, MA, a doctoral student in the department of psychology and neuroscience at the University of North Carolina at Chapel Hill. “The purpose of our research is to better understand the psychological mechanisms of hunger-induced emotional states — in this case, how someone becomes hangry.”

The research was published in the journal Emotion®.

When someone is hungry, there are two key things that determine if that hunger will contribute to negative emotions or not, according to MacCormack: Context and self-awareness.

“You don’t just become hungry and start lashing out at the universe,” said assistant professor Kristen Lindquist, PhD, the study’s co-author. “We’ve all felt hungry, recognized the unpleasantness as hunger, had a sandwich and felt better. We find that feeling hangry happens when you feel unpleasantness due to hunger but interpret those feelings as strong emotions about other people or the situation you’re in.”

Read more at American Psychological Association