There are three different levels, but he doesn't really say, like, who's supposed to do which levels? A level three you can do for several months. He says that's 12 hundred to 16 hundred calories a day. Level two, which is where karl logerfeld most of his time,you can do forSeveral months with medical supervision. That one's a thousand to 12 hundred calories per day. And level one is eight to 900 caloriesper day. Oh, and he says you should only do that one for two to three weeks. Men, you'll lose weight. You sure will. Can't stick to it very long, you'll be miserable and grumpy,