I asked this a few weeks ago. I think for me when I eat healthy foods my body still craves the unhealthy stuff too. So I windup eating both sometimes. And our bodies think that full feeling is our hunger being satisfied. I try to keep my calories around 1500-1600 which I think is a healthy amount. I'm eating vegetables, whole grains, getting in fiber to help try and fill me up.
I'm also trying to go vegetarian.. I noticed when I have 20grams of protein from tofu I get hungry faster than if I had 20 grams of protein from chicken. Vegetables proteins get digested faster than animal ones. I'm debating if going all vegetarian is going to make it too hard for me to lose and keep my weight down.
Sometimes my stomach growls, and I think it's what the above poster said our stomachs are still producing stomach acids and takes time to shrink down.
I'm right there with you though, it's so hard in the beginning when you feel so hungry.