Personally, I really enjoy eating foods that I feel fill me up quick and lasts. One power food that me and my weight lifting fiance really enjoy is lentils. We make a very hearty soup that is full of protein and fiber without any fat! I also do split pea soup with the same recipe. If you are interested let me know and I can put my full recipe up for anyone who has never made lentils before!
Also- fat free cottage cheese and greek yogurt are great options!