Wendy, even if your not losing weight, doesn't mean your not losing fat. You could gain muscles and lose the visceral fat at the same time.
The first to go when you exercise is the visceral fat in the abdominal cavity. Let your stomach go, and see if it bulges out (it bulges out a big for almost anyone), but if you look like Kermit, then you have got a lot of visceral fats. These fats are the worse by far, they cause much health problems. Even the love handles (over the muscle abdominal fat) is much better than that one.
I've lost 18 pounds since January 188 -> 170, just by eating slightly better than before. The crucial thing is to listen to your body, as soon as you feel even slightly full, stop. If you feel stuffed, you went too far.
Proteins help in curbing appetite.
All foods that are absorbed quickly boost insulin and thus boost appetite.
I just love salmon, I eat it 5 times a week. Its full with vitamin D, which was proved to be a major cancer fighter :-). And of course, its one of the best omega 3 source and all sorts of good fats.