The biggest myth in the "obesity crisis" is the idea that "fat" makes people fat. That's been a myth perpetuated on the American public for more than fifty years now. And, interestingly, that fifty years coincides with the greatest increase in American's weight and health problems. The reality seems to be that the low-fat and no-fat craze - initially fueled by the the government and the American Heart Association - is probably the most significant cause of increasing weight problems. That's why "Everything you think you know about fatty foods might be wrong."
The low-fat and zero-calorie hype is directly correlated with weight gain. For, as producers removed fat from foods, they actually increased the sugar. The rise in processed foods with a lot of sugar and empty carbohydrates is the link to weight gain.