Regarding my argument with M. Levac, an animal study would be accepted by him. But I'm looking for one with zero carbs and zero proteins, only fats. Of course, this could not be sustained for too long. He is convinced that it is impossible to grow fatter by eating only fats. I expect that on an all-fat diet, while creating a caloric surplus, you are going to lose lean tissue and increase your fat store. He says that's impossible since nothing would stimulate the release of insulin.
If I can show him direct evidence of this. I would make real inroads. But so far I did not find such a paper.