Why do we get angry and nervous when we are hungry.

The more time passes since the last meal, the less nutrients circulate in the blood. This includes lowering glucose levels. And if the values change significantly, the brain regards this as a potential threat to life and sends signals to release regulatory hormones. One of them is adrenaline, the hormone of fear. After the release of adrenaline into the blood, the emotional state is similar to that which occurs with a strong fright. A surge of this hormone can be accompanied by bouts of aggression or anger.