There is a chance that you may have slowed down your metabolism. 1200 calories is the minimum recommended calorie intake while dieting. Consider upping the calorie consumption slightly while increasing protein and decreasing carbs - especially if you are weight-training, you should see better results sooner with increased protein and decreased carbs. To help prevent your metabolism from getting used to 1200 calories - try 1500 one day, 1000 the next, 1200 the next and so on.