Actually, those results are from the original study that was done on, and promoted the keto diet.

There is no reason to restrict calories on a healthy diet; calorie counting is just a scapegoat used to keep people from looking at the actual issues: processed sugars, grains, and oils, dairy (which humans can't process), chemical ingredients, and all of the other non-foods considered "normal" for people to eat.

The truth of it though, is that any diet with animal products is neither healthy, sustainable, or moral.