“Come on, little fella – we should get going now.” But my son was not listening. The sand in the playground was just right, so he kept digging with his new toy excavator.

As I drifted back to my list of to-dos, however, the laughter was suddenly replaced by sobs. My son was not hurt, just very upset. When I looked at my phone, I saw it was well past his regular mealtime – and he was feeling very hungry.

However old we are, we all have a tendency to grow irritated if our body lacks enough fuel. But while humans have experienced this for as long as we have been on the planet, a specific word to describe the phenomenon only entered the Oxford English dictionary in 2018. “Hangry: to be bad-tempered or irritable as a result of hunger.”

Perhaps more surprising is the scarcity of research into how hunger affects people’s everyday moods. Most studies on food and mood have focused on patients with metabolic or eating disorders – perhaps because many psychologists have traditionally understood hunger to be such a basic physiological process.

So, with colleagues from the fields of psychology and mental health, I decided to investigate how different people respond to feeling hungry. We wanted to see if (and why) some people are better at reacting calmly when hunger strikes. Perhaps........

© The Conversation