how many calories are you hungry for? and how far is that from your ranges? and how long is recently?
because your body can go through hungrier or not hungrier phases and that's okay. but when you start noticing a consistent inability [and we're not talking 5 or 10 cals here, more in the hundreds] to get the calories your body needs to function, that's when you need to make yourself eat to get there. figure that the 1200 cal minimum is there so that you can get the nutrients you need in. it's possible to get what you need in less, but you generally have to be planning that out either very carefully or with a registered dietitian to make sure you're hitting the vitamins, minerals and macros your body needs.
so if you aren't hitting those lower numbers, you have to ask yourself what your body is sacrificing or having to duct tape together instead of fixing it. like if you aren't getting enough fat, then that means that you aren't getting all the nutrients out of the protein, fruits and veggies that you're eating because fat is what lets you access fat soluble vitamins and minerals and what helps make the protein you eat usable to your body. and it's those things that you need to paying attention to and that's what you're likely missing by not eating enough.
-google first. ask questions later.