Scientists have found that tailoring diets to the biology of their bodies resulted in better weight loss success. Specifically, people who naturally produced high levels of insulin fared better on a low-glycaemic load diet (which, if I'm reading it correctly, is effectively the Atkins diet), while those who didn't had better results from a more conventional low-fat diet. The causes of this are currently unknown, but the findings would seem to point the way toward more effective weight loss strategies.