I would think so.
I think I read that each pound of BF can produce 30 calories to be used. (I don’t remember the exact number) So, if you have 100 lbs of fat, you can get more calories from that then if you have 30 lbs of fat.
Yeah the closer I got to my goal the harder it got. It makes sense that your body and mind would sense that you’re getting closer to being in danger and ramp-up any sort of processes that encourage you to find food.