This book came out after I'd already lost 100 lbs. It's much more basic than the Dr. Johnson's JUDDD book. The basic premise is to eat 500 calories (men 600 calories) every other day, while on opposite days, eat mindfully.
The author does not address the fact "mindfully" becomes more and more difficult the longer you're on the plan. It is a great starting point. However, for me, as-is, this is an excellent maintenance strategy. Note: The science cited within the book mirror much of that of that which is already within the JUDDD book, published 5 years previously.
Dr. Varady has done a better job getting this lifestyle out into the public eye, whereas Dr. Johnson wrote the book and has made himself unavailable to the general public. Dr. Varady maintains a Facebook page.