Concentrated refined flours allow for the creation of high calorie foods that do not have the same ratio of water and nutrients that produce such as a potato or sweet potato have. When people were fighting for calories, this was great. When calories became cheap, this became a part of the overall weight problem. A 25 lb. bag of flour has 160,000 calories, 25 lbs of navel oranges have only 8,000 calories. which is more natural? Refined flour, sugar and high fructose corn syrup are probably driving a lot of the obesity related diseases. See Michael Pollan’s “In Defense of Food”.