I don't know much about the so-called Paleo Diet, other than the fact that it emphasizes eating a lot of meat and avoiding carbohydrates. This could be a good diet, for all I know, but it's pretty clear that there's nothing particularly "Stone Age" about it. So many changes have taken place in our food over the millennia that we probably couldn't eat like cavemen even if we wanted to. The wild plants available in the Paleolithic were a lot different from the cultivated plants and grains we have today, and the wild game was more rangy. And we don't really know that much about the real Paleo diet to begin with. For instance, it now appears that Stone Age people ate a lot more carbs than commonly believed:
"Analyses of Stone Age settlements reveal that the hunters were healthy and would gladly eat anything they could get their hands on, including carbohydrates – contrary to the modern definition of the Paleolithic, or Stone Age diet." Source: "Stone Age Hunters Liked Their Carbs," Science Nordic (2013).
"The low-carbohydrate Paleo diet has attracted star advocates, including professional golfer Phil Mickelson, actor Matthew McConaughey, and Republican presidential candidate Jeb Bush. But experts are now debating whether or not people in the Paleolithic Era did actually eat carbs." Source: "The Paleo Diet Has It Wrong: Cavemen Did Eat Carbs?, Market Watch (2015).
The Paleo Diet has been pushed with a lot of Conan-the-Barbarian marketing hype. You know the sort of thing -- "follow this diet and turn yourself into a savage, blood-drenched Cimmerian." That's not necessarily a bad thing, however. It's entertaining, at least. I'm a big fan of Robert E. Howard and I've read all of his Conan stories. From what I remember, though, Conan ate just about everything he could get his hands on. If he had a particular "diet," I'm not sure what it would be.
The biggest problem with the hype surrounding the Paleo Diet is that "we are not biologically identical to our Paleolithic predecessors, nor do we have access to the foods they ate. And deducing dietary guidelines from modern foraging societies is difficult because they vary so much by geography, season and opportunity." Source: Scientific American (2013).
Having said all this, however, I've got to admit that I've been cutting down on my carb consumption, partly due to my exposure to information about the Paleo Diet. I also avoid processed foods like the plague. As a result of this change in my diet, combined with a six-day-a-week weightlifting and aerobics routine, I've managed to lose almost 25 pounds. Whether my reduced carb intake had anything to do with my weight loss is another question because I've also been reducing the amount of calories I consume every day. I'm in reasonable shape, I suppose, but I'm not exactly Conan the Barbarian.
Making that transformation requires a lot more than eating more meat and cutting back on the pasta.
Related: PALEO DIET: Big Brains Need Carbs