When you haven't eaten in a while, your blood sugar goes down. When your blood sugar gets too low, cortisol (a stress hormone) and adrenaline (the fight-or-flight hormone) are released into your bloodstream to raise your blood sugar. This release of cortisol may lead to aggression. Having low blood sugar also reduces the brain's capacity to control impulses. Another factor that contributes to hangriness is that when people are hungry there is a reduction in serotonin, which regulates mood.
If you are prone to getting hangry, take steps to control or prevent it:
Eat several small meals throughout the day.
Avoid junk foods, which can cause another sugar crash — after they first incite a sugar rush. Nutrient-rich, high-fiber, high-protein foods are best and keep you feeling fuller longer.
Exercise regularly.
Get plenty of sleep.
Stay hydrated.
