There are programs that I've heard of and are advertised by chiropractors near me. I don't remember what the program was called now and they've renamed it, but when I first heard about it I googled it and found boards like this that discussed it. The promise is a loss of up to 40 pounds in 40 days and individualized plans based on metabolic scans. The board comments revealed it was a 500 calorie diet and of course no significant carbs and I have seen it work. Oh and it's about $2,000. Yikes.