I haven't read the book, tried the program, and may or may not be educated enough to speak on it
But I don't think there will be many, if any, here that are. We tend to avoid the whole cortisol connection theory because of the reputation of Corti-Slim and similar products, as well as the reputation of Shawn Talbott. From what I understand, this book recommends a series of questionable supplements. For example, they suggest avoiding ephedra, but taking bitter orange. However, bitter orange works like ephedra in the body, and Consumer Reports listed it in the "dirty dozen" of most dangerous supplements.
It's our opinion that to lose weight, we should focus on a healthy diet and exercise program, and avoid diet supplements, other than a good multivitamin or anything our doctor recommends.
Does the diet in the book look balanced, and does it look like something that will fit your lifestyle? If so, then it would probably work for weight loss, even without the supplements. I would suggest showing the plan to your doctor before trying it. There are a lot of diets to choose from, and many are better proven to be safe and effective.
Good luck