1. When glucose levels in the blood fall, we get hunger pangs in the stomach. Feeling hungry lies in the physiology of blood circulation.
2. The secretion of the hormone GHRELIN starts in the stomach when it goes empty.
3. Hunger contractions start to occur in the stomach due to hunger generating signals that reach the brain from the stomach due to ghrelin.
4. So Rajesh effected with secretion of ghrelin in his stomach and he felt hungry when he saw food.
5. Sheela was not affected with secretion of ghrelin in her stomach. She felt that her stomach is full.
6. When we feel the stomach is full and there is no need of food any more, another hormone LEPTIN is secreted that supresses hunger.
