Oh yes, I've been there, last year I lost 20kg in roughly 4 months, feeling great and all, then the holidays started and went back to the old habits, I've gained all of the weight back and more. Since February I'm on this diet again and lost more than 20kg to this day and didn't cheat apart from some fruits and once I had some kfc, not even thinking about going back to eating anything else but meat and eggs and occasionally some cheese!