Hunger:This is a physiological need for food. It's like the low fuel warning light in your car telling you it's time to refuel.
Appetite:This is a psychological desire for food. It's like seeing an advertisement for a new model of car and wanting it even though your current vehicle works just fine.
Satiety:This is the feeling of fullness after eating that reduces the urge to eat more. It's like having a full tank of gas; there's no need to stop at another gas station until you've used up what you have.