I think you might be bored with what you're eating.

Try another kind of diet for awhile. I switch diets every 3 weeks or so, so I get a large variety of foods. Anything gets stale after awhile. You can try a less restrictive LC plan like CAD, or Somercising, or actually do what I do which is go on a low fat/low calorie for a week or so just to shake things up.