How come everytime I go a few days or weeks without eating it always hurts really bad when I finally eat?

How come everytime I go a few days or weeks without eating it always hurts really bad when I finally eat?

And if you’re wondering why I go so long without eating sometimes just know that I drink ZzzQuil a lot almost as much as I drink water

How come everytime I go a few days or weeks without eating it always hurts really bad when I finally eat?
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