I have done seemingly every diet on the planet, but the only other plan on which I had great success was The Belly Fat Cure, where I lost about 45lbs in a year. I feel that it trained me well for what to expect on IP, to understand more about the issues related to insulin and insulin resistance, and taught me some great recipes. I had temporary amnesia (I think, because I obviously forgot everything I learned) and gained the weight back. IP works MUCH faster and the stricter rules have been more helpful to me (except in restaurants, which is the only time I really hate IP!). I would recommend the BFC to anyone who was interested in a low-carb diet, but who didn't think s/he would be able to stick to something as stringent as IP. I am looking forward to incorporating some of the BFC's concepts into my maintenance plan.