I personally feel nature is always best. To use the comparison of human athletes to lurchers/hard working dogs i would question what you beleive to be a natural human diet. It is widely beleived we live much healthier on a seasonal diet largely made up of carb based foods, fruits and veg, nuts, seeds etc with meat/animal fat occasionally as to simulate a natural diet where hunting would only occasionally produce such high calorie foods. We dont live on a solely raw diet because of flavour, cooking makes food more paletable (sp). Also on the human athlete comparison, there diets are very simila