Each person is different in a “Can we even see the same colors” sort of way. It’s really complicated, but essentially the stomach sends a signal to the thyroid which releases hormones for metabolism. Hunger is a mix of physical signals and hormones.
The body is more aware of changes than absolute values. So it gets used to things until the next change ie. Hunger pang.
Eventually the system gets confused if the signal persists, but at that point you are looking at more starvation or thyroid problems. Most people never get to that point though.
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