>Maybe I missed it in the article but this just seems like calorie restriction to me. Its much harder to eat a large amount of calories if its just meat and vegetables.

When people talk about a calorie-restriction diet, what they mean is you count the calories in every food, and then keep caloric intake below a certain level by intentionally eating less than your appetite desires.

In contrast, in this diet, people focused on eating the right foods, and ate as much as they wanted, and the reduction of calories was a consequence.