Final answer:
Appetite is the psychological desire to eat food and is regulated by various physiological mechanisms in the body. The brain signals satiety when the stomach is full, reducing hunger.
Step-by-step explanation:
The psychological desire to eat food is known as appetite. Appetite is regulated by various physiological mechanisms in the body. The brain plays a crucial role in signaling hunger and satiety. When the stomach is full, the brain sends signals that you are satiated, which reduces hunger.