Question

what made a human hungry

Answer 1

Hunger is our bodies response to having eaten less than normal. It is caused by the brain reading changes in the levels of hormones and nutrients in the blood. It is our reaction to this feeling that can make us overeat or eat the wrong things.

Answer 2

Several other hormones influence hunger. Two major ones which tip the balance between hunger and fullness are leptin and ghrelin. Leptin is released from the body's long term fat stores, which we all have, and suppresses hunger while ghrelin causes stomach rumblings as a physical reminder to eat.