It might just be that the diet program itself is too niche...I've certainly never heard of it. I think if you were looking for blogs that covered the diet program, and only found a few (that were long dead), that should be a pretty strong clue that maybe there just isn't enough interest in that program to warrant an app.

Also, pawn-soft is not a great name for a company...I realized after going to the site that you meant a chess piece pawn, but at least for me the first thing I think of when I see pawn is a Pawn Shop, which has a lot of negativity associated with it in most people's minds. Especially on the Internet where a lot of folks are already wary of getting scammed, you might want to change the name to something else.