I WONDER - How Do You Know When Your Stomach Is Full?

The video explains how the stomach communicates with the brain through the enteric nervous system, often called the second brain. This system helps regulate hunger and fullness by sending signals to the brain. Additionally, the stomach releases the hormone ghrelin, which stimulates appetite and signals the brain when it's time to eat.

What is meant by the term 'second brain' in relation to the stomach?

In what way does ghrelin inform the brain about eating?