My understanding is that you feel "I'm hungry" when your blood sugar drop below its typical level. The typical level can be increased by eating a lot of sugary

My understanding is that you feel "I'm hungry" when your blood sugar drop below its typical level. The typical level can be increased by eating a lot of sugary processed food over a long period of time. In other words, sugary processed food change your body chemistry to make you addicted to them. If you largely eat healthy food and are at a healthy weight, then "I'm hungry" is a reliable signal for "I need more calories". If you are not, then it becomes a one-sided biased signal.