Yeah! A fad lasting millions of years of human evolution, however.
Practically advocates of every fad diet claim so.
The fad lasting millions of years is "eat what you can get, what is fibre?"
This has been the recommendation for general health for as long as I have been alive. Fiber is really important and there are plenty of easy healthy options that are cheap, unlike the astroturfed beef checkoff primal diet
The charitable interpretation is "just eat more fiber, regardless of the rest"