I've just read the article Ffion linked. I'm no expert, but I think there is a lot of confused thinking in the section on 'metabolic chaos' (even the title they have chosen for the section speaks volumes about their lack of understanding). In a piece about how obesity causes cancer, they're effectively saying that losing weight (the body fueling on fatty acids released from its own fat stores) is causing cancer, because there is excess insulin in the blood... not if you don't eat the carbs that make the body release the insulin in the first place, there isn't.