If eliminating gluten and processed foods from your world makes you poop better and your skin all glowy, go nuts. May neither a bagel nor a cupcake darken your gaping maw again. But let's not use evolution as an a reason to not eat a baguette with some brie.
My extreme eating plan is designed to manage autoimmune disease by healing the gut. Did I enjoy giving up nuts, tomatoes, eggs, seeds, and lots more? Nope, but my awful health issues gave me no other choice.