Why do we get hungry?
The feeling of empty stomach states need of nutrients or food is defined as hunger. Eating a full meal and then feel hungry is not hunger, it is called as appetite.
After eating a meal, continuing to pick at appetizers all night while at party is an example of appetite.
Appetite is defined as desire of food. Apptite is experiencing aroma or sight of food even after a meal which means even the stomach is full. After having lunch, desire for dessert is an example of appetite.
Hunger starts when nutritive material is missing in blood and then message is sent to ‘hunger center’ which is a part of brain. This center makes stomach or intestine active and sometime individual hear that his stomach is rumbling.
When person gets sufficient food, then hunger center slows down the action of stomach or intestine.