It's not a weight-loss diet per se, although in theory some people will lose weight from it. Go to
www.makersdiet.com
to get more info but in a nutshell the guy who wrote the book suffered from Crohn's disease and tried a billion different treatments without having success until he heard about this guy in California who subscribed to something he called the Bible diet. Basically the California guy had researched the Jewish population from biblical times to the present and noticed that, in general, they were much more resilient than other groups of people (through things like the bubonic plague). His research is more complex than that but the bottom line is he concluded that their diet, the way God instructed them to eat in Old Testament times, was responsible for their health and longevity. So the author of the book moved to California and followed the diet and claims that his Crohn's disease was cured (there are photos of him in the book from before, when he was 6'0 and weighed 105 pounds, and after, when he weighed 175 pounds). Since then he has been spreading the word about this diet (which is really more of a lifestyle), which he believes can both prevent and cure most of our health problems and lead us to our optimum state of health. There's much more to it than that, but that's the basic story.
The book details a 40-day plan, comprising three phases, with the first phase being the strictest and the third phase being the most lenient. It's a completely kosher diet focusing on organic fruits, vegetables and eggs as well as free-range meats like beef, chicken, wild fish, etc. No alcohol, no pork, no shellfish, no added sugars, no simple carbohydrates. Very goat-intensive, i.e. goat cheese, goat milk, goat yogurt, etc. Coffee is allowed, but only certified organic. Many other things too but those are the highlights. Spring water preferred at all times.
The first phase, which I am on right now, also prohibits things like beans, rice, bread, pasta, starchy vegetables and fruits, etc. The idea is to radically "detoxify" the body and then gradually introduce other acceptable foods later. So basically at the moment my diet consists of goat by-products, eggs, lean meats, almonds (allowed in phase 1), organic vegetables, raw almond butter (also allowed, although few other nut butters are), tuna canned in spring water, and fresh berries. The complete lack of sugar is what's making me so lethargic I think, so I'm definitely making some coffee in the morning. Anyway, that's the basics.