I recently read a book by Dr. Aseem Maholtra – “The Pioppi Diet“. In it he explains the science behind his recommended diet: low carb / high fat.
He cites various studies which point to our high intake of refined carbs and sugar being the cause of vascular disease and the diabetes epidemic. He reckons this type of diet will improve your glucose and lipid numbers. Insulin resistance is also reduced.
One reputed adherent of the low refined carb diet is Queen Elizabeth II. She seems to be in good shape for her age so there might be something in it. (She does like cake though, apparently.)