Science explains why hunger turns people into 'hangry' monsters

A new study has confirmed what many already suspected: hunger can make people angrier. Published in PLOS ONE, the research found that low blood sugar and hormonal shifts play a key role in mood changes. When hunger strikes, irritability and frustration often follow—sometimes leading to what’s commonly called being 'hangry'. The study revealed that hunger accounted for 37% of spikes in irritability, 34% in anger, and 38% in reduced pleasure. These mood swings happen because dropping blood sugar levels trigger the release of stress hormones like adrenaline and cortisol. Evolutionarily, this reaction may have helped ancestors secure food when resources were scarce.

Keeping snacks nearby can prevent these 'hangry' moments by quickly satisfying hunger. Nutrient-rich foods, in particular, help stabilise blood sugar and keep moods steady. Staying hydrated also reduces unnecessary irritability caused by dehydration. Beyond diet, good sleep regulates hunger hormones and cuts down on cravings. Emotional self-awareness helps too—recognising when hunger affects mood allows people to take action before frustration builds. Eating at regular intervals remains one of the simplest ways to avoid hunger-induced anger.

The findings highlight practical ways to manage mood through diet and habits. Stable blood sugar, proper hydration, and adequate sleep all reduce the likelihood of anger linked to hunger. By making small adjustments, people can avoid the irritability that often comes with an empty stomach.