I'm always deeply, deeply suspicious when someone advocates cutting out a huge swath of foodtypes from a diet (unless you're dealing with, say, an allergy or intolerance. If you break out in hives when you eat tree nuts, don't eat tree nuts; if you're gluten intolerant don't eat gluten. But there's a REASON to avoid those foods). Human beings are omnivores. We evolved and adapted to eat a wide range of food, and that includes root vegetables and grains and fats and sugars and meats* and plants and carbohydrates. Following a "caveman diet" or cutting out anything even remotely resembling a carb, or saying that one should never eat bread made of white flour because when you mix water and white flour together it forms glue and thus white bread will literally turn to glue and glue together your intestines sounds... faddish. And short sighted. There's a lot we still don't know about human bodies and the nutrients we need to be healthy and strong. Cutting out huge swaths of potential nutrients is just... man.

(*I'm not trying to be anti-veg*n. If you chose not to eat meat/animal products for moral reasons, that's a personal choice I'm not going to argue with.)