Science confirms: Hunger really does make people 'hangry'

A new study has confirmed what many already suspected: hunger can make people angrier. Published in PLOS ONE, the research found a clear link between low blood sugar and heightened irritability. The findings suggest simple changes in eating habits could help avoid these so-called 'hangry' moments. The study revealed that hunger accounted for 37% of spikes in irritability, 34% in anger, and 38% in reduced pleasure. Scientists believe this reaction has deep evolutionary roots—when food was scarce, anger may have helped early humans secure meals. Today, the same biological response still kicks in, triggered by drops in blood sugar and surges in stress hormones like adrenaline and cortisol.

Keeping snacks within easy reach can prevent these mood swings by stopping hunger before it escalates. Nutrient-rich foods, such as nuts, fruit, or whole grains, stabilise blood sugar and reduce the risk of anger flaring up. Planning meals and snacks ahead of time also helps maintain steady energy levels throughout the day. Staying hydrated plays a role too, as dehydration can worsen irritability. Beyond food and drink, the study highlighted emotional self-awareness as a useful tool. Recognising when hunger affects mood allows people to take quick action—like eating a small snack—before frustration takes over.

The research shows that regular eating, balanced nutrition, and hydration can keep 'hangry' episodes in check. By understanding the connection between hunger and anger, people can make small adjustments to their routines. This could mean fewer outbursts and a more stable mood throughout the day.