Ah, so it is an American fad then.
I wouldn't describe it as such though, there's plenty of faddy diets coming from all over. The science behind this one is faulty though.
How to Really Eat Like a Hunter-Gatherer Why the Paleo Diet Is Half-Baked Interactive Infographic - Scientific American
It sounds a great idea but when you actually start researching it's nonsense. Cutting out processed food is good but what are you replacing it with? The meat may be organic and grass fed but it's from domesticated animals not wild animals which are now extinct. The honey you are 'allowed' eat, isn't from wild bees, they are domesticated etc etc. It really can't happen, we have evolved and the food we eat whether animal or vegetable has evolved too.