The Shoe Diet:
On this diet all you can eat is shoes. This isn't as restrictive as some might think, given the current trend of fashioning footwear out of edible materials, such as bacon boots, pasta platforms, and fish slippers.
On this diet you can only eat sand. Nobody has taken this diet and lived to tell the tale.
Overall I think you'll see that out of this exhaustive list of possible dietary choices, I have selected the right one, both nutritiously, tactically, and morally, and I am therefore superior to you in some arbitrary way. You are therefore now obliged to make me a spaghetti bolognese.
Meat free of course.