Does surgery change how hungry you are??

I don't know if it's just me but I can't get a specific answer to this question. I've read lots of profiles about how people feel once they've lost the weight but I have yet to find out exactly how this surgery changes your hunger level or ability to eat a lot. I need to know what exactly this surgery does that keeps you from overeating or feeling constantly hungry? Could someone please tell me in specifics does this keep you from being hungry? Is it physically impossible for you to overeat?? What exactly is this surgery doing that is causing you to lose weight?

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