Although these studies indicate IUD users experienced weight gain, it's unclear if the gain was due to the IUD or normal aging and lifestyle factors such as diet and exercise. Removing the IUD didn't necessarily result in weight loss.

Will copper IUD help me lose weight?

Weight gain related to birth control tends to be associated with changes in hormone levels. Since copper IUDs don't affect your hormones, it stands to reason they wouldn't cause any changes in weight, while in place or after removal.

How do you lose weight with an IUD?

Consider making some lifestyle changes to avoid weight gain after getting an IUD. Exercising regularly, healthy eating, and all other common weight loss methods should minimize the chances of any weight change after getting an IUD.