Are you using Fitday? Perhaps you should, and enter what you are eating for nutritional counts. Sounds like you might be eating enough calories to stay at your weight, but not enough to lose any. You should try to make sure, and also add exercise.

People see the calorie thing as controversial, but I've done low-carb for years (lost 35 lbs long ago), and I never lost weight unless my calories were around 1500 a day (with exercise). But everyone is different...