I think that might be a good book, I haven't read it personally. But that is the same premise as the diet that I have been using for a while now. My program was body makeovers, and their program works the same way. I eat 6-7 small meals a day, and it is a small amount of Turkey Fish or Chicken, with a veggie, and or a fruit / carb, like an apple or half of a yam. It really works for me, and you are right, it makes you feel like you are detoxing, because all the processed foods are removed from your diet.
I don't know what the book will tell you about portion size, but one thing I found out, is even though the portions are small, in the begining it really feels like a lot of food. But that got better in a few weeks. And the only thing that gets really restrictive is when you are going out for the weekend, or a party. Sometimes I get bored of the salads with some grilled, no salt, chicken or fish, but I am at the point where if I eat something that is too bad for me I get kind of sick. And of course I am used to a few drinks when out. So, sometimes I'm good, and sometimes I not. And to be honest, sometimes I don't order the salad... But I had been stuck in the 190s for a while, but once all the processed foods got out, it balanced my blood sugar. I really felt a healthy detox effect, which really helps the weight to keep coming off, and depending on how "good" I am during the week, I will lose 1 to 3 pounds a week. But if you are thinking about getting healthier, I would say do it. Because I feel so much better since cleaning up my diet. My program was a little expensive ($500). They customized it for me and kept in contact with me. Because my house is littered with books either fully read or not at all, so I needed them to help keep me honest. But those are the words they liked to use too, "eating clean" so, I would try it!!!
p.s. This was my first post, I hope it wasn't too long