Do you follow the suggested half hour walk every day too? And you can really eat an unlimited amount of the approved foods? If yes, I think I'm sold...
I don't exercise regularly at all but I'm not proud of it. I should. I suspect that for the final 13 pounds I'll need to do the exercise more religiously.
You can eat an unlimited amount of low fat protein. It's very very important, never to be hungry. So you should always have backup food available such as plain Greek yogurt, strawberry light geek yogurt, fish, reduced fat American cheese and string cheese, and even diet cheese cake. ( I like "say cheese").
But keep in mind, that weight loss, in my experience, works quicker if you don't eat as much even from allowed foods. So if I eat fish for supper instead of beef I lose more. But it's more important not to be hungry.
Also don't forget to drink water and eat the allowed amount of oat bran which is a must on Dukan.