Question

How do you come to know that you are hungry?

Answer 1

Hint: Hungry means a state where there is an urge to eat. Extreme hunger leads to nausea, dizziness due to a rise in gastric hormone and due to less amount of stored energy.

Complete answer: We come to know that we are hungry when we feel an urge to eat when there is growling in our stomach.
1. The physical sensation of hunger is related to contractions of the stomach muscles.
2. These contractions are sometimes called hunger pangs once they become severe.
They are believed to be triggered by high concentrations of the ghrelin hormone.
3. Ghrelin can be released if blood sugar levels get low—a condition that can result from long periods without eating.
4. Hunger pangs can be made worse by irregular meals. People who cannot afford to eat more than once a day sometimes refuse one-off additional meals, because if they do not eat at around the same time on the next days, they may suffer extra severe hunger pangs.
5. Older people may feel less violent stomach contractions than younger ones when they get hungry, but still suffer the secondary effects resulting from low food intake: these include weakness, irritability, and decreased concentration.

Additional information: Prolonged lack of adequate nutrition also causes increased susceptibility to disease and reduced ability for the body to self- heal.
The brain evaluates the contents of the gut through vagal nerve fibers that carry signals between the brain and the gastrointestinal tract (GI tract).

Note: The hormones Peptide YY and Leptin can have an opposite effect on the appetite. It causes the sensation of being full.