Good question, since they TOTALLY miss the point. That is, there is a diet - that which you eat for sustenance - and there is a Diet - that which you eat to loose weight. (If you will allow me to create a way of distinguishing between the two by capitalizing the former.) The media also is only focused on weight, but many of "US" are also as much interested in the health benefits as the weight control.

To be successful, you MUST adopt the "new" diet as a permanent way of eating, not just a short term thing you do and then go back to the diet that got you unhealthy and over weight.