17 day diet is just another basic diet with a bunch of hype and marketing. If you look at the reviews on Amazon there are a very large number of 5 star reviews where the reviewer has only reviewed one thing ... the 17 day diet. Hmmmmm...
It annoys me that they claim the 17 day diet will speed up your metabolism. Sure it will. Also likely is it will unite our planet in a never ending golden era of world peace.