Take a look at the homeopathic HCG diet. Men lose an average of a lb. daily and women an average of half a lb. daily.
Go to this link: http://ketomist.com/cmd.php?af=1205831
Read everything there and watch the video. Get the eBook written by Dr. Simeons and read that. Note that it is written for a different (injectable rather than oral spray) version of this diet so there are some small differences in the food plan (notably that you cannot have coffee with the spray, that you can have unlimited amounts of the allowed vegetables at each meal as long as you don’t mix different kinds of vegetables and there is some differences in the choices of fruits & vegetables).
Please note that to do a full round of this diet you need 6-7 weeks of the diet phase followed by 6 weeks maintenance. There is not presently enough time before Pesach to do it properly (the homeopathic spray itself is chometz and the first 3 weeks of maintenance do not allow any starches or sugars).