" Our genes still expect us to eat a higher fat diet; they still see agricultural foods (and modern foods such as sugar), as poisonous; they still see lack of sunlight and exercise as problematic. We haven't genetically adapted to modern life because there is no selection pressure in the civilised world. "

― Mark Sisson , The Primal Blueprint 21-Day Total Body Transformation: A complete, step-by-step, gene reprogramming action plan