Most people put on at least a little weight over the holidays, and few actually take it back off. In her new book, The Doctors contributor Liz Vaccariello says you can lose weight while still eating anything you want, so long as you exercise portion control.

In 400 Calorie Fix: The Easy New Rule for Permanent Weight Loss! Liz says that participants can lose weight by simply keeping all their meals to 400 calories or less. In a small study of just 16 men and women, all of them lost about 2 pounds a week on the plan and continued losing weight after.

If you want to get rid of some excess pounds, this might be the plan for you. No specific foods are restricted, but the amounts are. 400 calories per meal is the number one rule to remember to help drop the holiday weight.