Fast 800, it is easy to lose weight with it. We went through the recipe book page by page, did an excel sheet with each meal we would eat under the calorie sections so had a list of 200, or 300 calories etc. We tend to have 200 calorie lunches and 600 calorie dinners, no breakfast. Depending on how much weight you have to lose it should be a good chunk from week 1 alone. I lost 9lb week 1 and another 5lb in week 2.
Although we use the book we also use our own recipes but no rice, pasta or potatoes.