Don't be an "extremist" with your weight loss journey. If your body is used to 3000 calories a day, and taking food in whenever you feel a pang of hunger, well it's not going to like you limiting the calories to 1200 calories and "starving" through those pangs. Set a goal of 1500 calories and spread them out throughout the day. Eat an apple or even a small salad for a snack. Chew on some celery or carrot sticks You would be surprised at what you now like.