We are (I was) following a diet called, "The Protein Sparing Modified Fast"... This diet only makes sense for people who need to lose a significant amount of weight and should be done under medical supervision... in other, please be careful if you are considering something like this... Here are some details of the Dr. who pioneered this diet along with a brief blurb about it... I am also attaching what I ate for the 1st 2 months of my 4 month diet...
George L. Blackburn, M.D., Ph.D., is an internationally renowned expert in the fields of obesity and clinical nutrition.
-medical degree from Kansas Medical School
-doctorate in nutritional biochemistry from the Massachusetts Institute of Technology.
-currently holds the following appointments and positions at Harvard Medical School:
1)S. Daniel Abraham Chair of Nutrition Medicine
2)Associate Professor of Surgery
3)Associate Director of Nutrition, Division of Nutrition
4)Director of Nutrition Support Services
5)Chief of the Nutritional/Metabolism Laboratory
6)Director of the Center for the Study of Nutrition and Medicine at the Beth Israel Deaconess Medical Center.
-President of the North American Association for the Study of Obesity
-immediate Past President of the American Society for Clinical Nutrition.
-Fellow in the American College of Surgery
-Chairs the Massachusetts Medical Society Committee on Nutrition, and the Scientific Advisory Committee for Shape Up America! (Koop Foundation).

The protein-sparing modified fast (PSMF) diet was developed in the 1970s by George Blackburn. Blackburn, found that patients required 1.2 grams of protein per kilogram of ideal body weight in order to maintain a positive protein balance, rather than the 0.8 grams of protein per kilogram that was recommended by the US Department of Agriculture . Although some high-level athletes can consume on the order of 500 grams of protein per day during high-intensity competition, it is difficult for some people to consume adequate lean protein without consuming excess calories, or to eat lean meats or fish at each meal. One solution is the development of a formula that provides a complete, nutritionally balanced diet. A formula-only plan can ensure that the patient obtains all necessary protein, vitamins, and minerals, while losing weight on a plan that can provide as little as 800 calories per day. Protocols may be supplemented with coordinated nutritional bars and/or some self-prepared foods. A physician or other knowledgeable health care professional should supervise use of nutritional formulas.

THE KETOGENTC OPTION: The Protein Fast through the induction of triglyceride catabolism, encourages the oxidation of free fatty acids at the hepatic level and provokes the famous physiological phenomenon of compensated acidoketosis that BLACKBURN called KETOGENESIS. The constant and controlled presence of ketone bodies in the body shows the perfect adaptation of the human system when subjected to a fast supplied with a precise amount of amino-acids.

As long as the human body has an excess of fat that should be eliminated through ketogenesis and mainly through the Protein Fast, the effects of ketogenesis persist during this diet and supply the body with most of the energy it needs.

All these metabolic reactions that take place during the Protein Fast and that Blackburn carefully described in his many books and articles, are absolutely safe.

As a matter of fact, this method is based on strict scientific data and its application should be made according to a precise protocol.

The Protein Fast has specific advantages that no other diet offers whether it is the low-calories or the dissociated diet.