I believe that God created the world and everything in it, including ourselves. I believe we were designed to eat wholesome natural foods and that he provides for our every need.
In following the primal way of eating (and other principles such as getting outside in the world of nature and sunshine), I feel I have aligned myself more with the way our Maker intended us human beings to live. Surely we were not made to survive on Happy Meals and goo produced in factories.
I have also discovered greater peace, self control, tolerance which on one level astounds me, and on another level should not surprise me at all. I see it as confirmation that if we adopt His precepts in one area of life, the benefits are bound to spill over into other areas.
I don't fully understand why the grains are not as wholesome for us as other foods, but put it down to combination of not being as they were originally due to artificial development etc and being intended more as subsistence in times of famine rather than a premium quality food for best health.