I think 3 days of this is fine..and won't hurt you. A week...I would question. It will help the cravings...but I still think doing a week of 1st week of Atkins or SouthBeach...will help too. Maybe a next step...or just really don't let yourself stop at Starbucks... don't have chips/soda in the house. I find...not having that stuff...helps me out tremendously.