Reddit reviews The Jungle Effect: Healthiest Diets From Around The World--Why They Work And How To Make Them Work For You

This article doesn't appear to take the issue seriously.

One interesting detail is the mention of lean meats. There is a great deal of evidence that meat eaters have sought out and valued animal fats both for diet and also for various other uses such as lubrication and lamp oil. The Paloe Diet craze and the refutation of the dietary fat hypothesis went along together.

Arguments supporting the Paleo Diet are complex and involve not just evidence about what was eaten by whom and when, but also how social structures related to diet. There is considerable evidence that the neolithic adoption of agriculture was accompanied by a decline in physical size and general health. There are some significant scientific results related to that subject, perhaps most notably that acne as we currently experience it is a relatively recent introduction related to cultural changes, especially diet: Acne Vulgaris: A Disease of Western Civilization.

The details also make a big difference. When people talk about "wheat" they often make references to the neolithic agricultural revolution which made use of Emmer and Eincorn grains, but modern wheat is almost exclusively Triticum Aestivum which is a mutant dwarf variant with an extra chromosome that produces much larger amounts of gluten than older grains. If problems digesting gluten are suspected then eating foods with especially large amounts of gluten may not be advisable.

To the extent the idea of a Paleo Diet is problematic a potentially interesting alternative to examine is the Archevore diet which removes the most recent and problematic additions to modern diets instead of attempting to reconstruct historical diets.

Another potentially interesting take on alternative diets is Daphne Miller's The Jungle Effect which examines the diets of groups of people who exhibit unusually low rates of various forms of disease.

Awesome. You should also see if you can get her to read The Jungle Effect. It can get her thinking in the right direction.