No I have not tried it and here is why. Please pay extra attention to what I put in bold italics and underlined.
The total calorie count of the diet comes out to approximately 800 calories per day, and total carbohydrate intake is about 70 grams per day, making Siegal's program an extremely low-calorie, low carbohydrate diet.
What is not as frequently mentioned is that reportedly, as many as 60 percent of patients on the Cookie Diet are also prescribed appetite suppressant drugs, and another 25 percent are prescribed thyroid hormones.
The cookies, which Siegal claims have amino acids with appetite suppressant properties, are available in chocolate, raisin or coconut flavors, but even Siegal admits that they don't taste very good. Don't look for them on your local store shelves anytime soon, however. Siegal's cookies are available only to patients at his weight loss clinics (five are in Florida, and one is in Montreal), as part of his estimated $400 a month weight loss treatment program.
Some weight loss experts say that any diet that provides only 800 calories a day is bound to work, but at what price? Experts say that the diet provides far too few calories to maintain health and energy, and is seriously lacking in fruits and vegetables. (1 cup a day of vegetables doesn't make a dent in the recommendation that we eat 5-9 servings a day of vegetables and fruit). Others have alleged that the Cookie Diet doesn't provide sufficient vitamins, minerals, and fiber. Even Siegal admits that the Cookie Diet is not meant to be used for long periods of time. Many diet experts say that once people resume normal eating habits, they will regain the weight lost on drastic diets like this one.
So please if you want to diet, just make a lifestyle change and start eating a sensible diet.
Good luck and best wishes.