I tried it last year, and lasted a week. I need carbs! I just found it a tad too restrictive for me, by the end of the week I was salivating at the thought of eating a slice of bread! I also realised that it just wouldn't be sustainable in the long term - too hard making different food for the kids, and having all the foods that I wasn't allowed to eat in the house, because the kids eat them. The shakes were yummy though, and I did lose weight in that week. It just wasn't for me - I ended up doing weight watchers which worked a lot better for me.