According to some experts, humans did not evolve in order to eat a diet high in starch and sugar. "Grain products and concentrated sugars were essentially absent from human nutrition until the invention of agriculture, which was only 10,000 years ago, "says David Ludwig, a Harvard Medical School researcher. That's only a drop in the bucket when we consider how long humans have been on Earth.
Amazingly, the low-fat philosophy is only about 25 years old. Prior to the 1970's, it was an accepted fact that fat and protein were good for us because they made us feel full and kept us from craving the carbohydrates that ultimately make us fat.