Why am I sooooo hungry and am thinking about food...

But I can't actually bring myself to eat anything?. I have a whole pizza in front of me with everything I like and I could probably tear it all up like it's a competition. I can't touch it. I'm hungry, my brain is at the stage where it's trying to drive me to eat, but I just can't. I even think about binging the whole thing...still won't.

This issue started cropping up gradually a week ago. Went from two meals (never been one to actually eat three meals, so it's not unusual), to one, and now, none. And I'm not thinking to myself about anything... not thinking about being fat if I take a bite, no guilt, no shame, nothing. I don't purge because there's nothing to purge. I don't workout because I'm too exhausted to.
I lost four pounds in a week.

And yeah, it's nice because I've always been large statured since my existence. Is this something even relatable or understandable? Idk.