In my younger days, (when I still had will-power
), I used to go on fruit, nut and vegetable diets. Ate only raw, unprocessed things.
The first 36 hours are a little difficult, but after that I felt fantastic. Great thing about this diet is, that you can eat as much as you want.
Longest I did this was for 3 weeks and I lost a lot of weight that way. But, as with all diets, the poundage returned pretty quickly.
And it is not a very social diet, no eating out, boyfriend couldn't keep it, so he had to cook just for himself.