Hunger pain slowly becomes something your body (or maybe mind? idk) ignores. I get hunger pains for about half an hour and they barely hurt now and then just disappear.
If I don't eat for a really long time and and do too much physical work, I tend to start feeling faint and end up "throwing up" but since my body has nothing to throw up, nothing comes out except a little stomach acid.
I want to eat more but it's almost like a habit and a mental barrier to not have the energy to cook anything. Normally by the time I eat, I'm too sick to eat a lot and my body tells me I'm full from minimal amounts of food, so then I don't eat again for awhile, and end up having the equivalent of maybe one healthy meal throughout the day.
There are some days where I eat "a lot" (probably just a normal amount of food for most people).
It does effect my mood quite heavily, and my desire to do anything physical also is heavily effected, since I'm used to my body deciding to throw up whenever I try to.