Can you undo your past health mistakes?

You were a yo-yo dieter

Damage done: It was once thought that repeatedly losing and gaining a stone or so messed up your metabolism, but recent studies dispute this.

Bounce-back factor: Good. There's nothing to stop you losing weight and keeping it off. America's National Weight Control Registry (a database of 5,000 people who have lost 30 pounds and kept it off for a year) shows it can be done. Members say small lifestyle changes are key.

Read more on maintaining weight loss