I'll note that all the animals in this study are eating diets provided by humans, or derived from human diets (feral rats).
What about wild animals eating traditional diets?
Scientists can be so dense...
After going paleo/primal myself, I did the same for my dog, after noting most of the available dog foods are all grain, soy, and veggie oils. He doesn't overeat, and doesn't have an ounce of fat on him.
Via John Durant.