Scientists uncover how hunger neurons drive food-seeking behavior in the brain

A new study published in Nature explains how hunger pushes animals to seek and consume food. Researchers at Beth Israel Deaconess Medical Center have uncovered key details about the brain’s hunger neurons. Their findings reveal how these cells influence behaviour in the presence of food cues. The team, led by Bradford B. Lowell, focused on AgRP neurons in the hypothalamus. These neurons trigger hunger after periods without food. Fasting activates them, while the sight or smell of food suppresses their activity, reducing hunger signals.

Using a genetically engineered mouse model, the scientists could switch AgRP neurons on and off. They also mapped the neurons’ connections to other brain regions. The study found that lowering AgRP activity acts as a reward, motivating mice to approach food cues and complete tasks for food.

Blocking the network that inhibits AgRP activity disrupted the mice’s ability to learn food-related tasks. This suggests the neurons play a crucial role in linking hunger to food-seeking behaviour. The work builds on over a decade of research at the medical centre, a Harvard affiliate. The National Institutes of Health provided funding for the study. The research highlights how AgRP neurons control hunger and drive animals to find food. By switching these neurons on and off, scientists confirmed their role in reward-based learning. The findings offer clearer insights into the brain’s hunger mechanisms.