Just a one-liner (as if!) via mommymd commenting on an old post:
Differential Metabolic Effects of Saturated Versus Polyunsaturated Fats in Ketogenic Diets
I think I worked through this several years ago but didn't have the tools to comment on it at the time. The recall I have is of reading what the high PUFA group ate. Fake bacon, soy nuts, vegetable oil. Lovely. BUT they ended up much more insulin sensitive than the saturated fat group did over 5 days. Higher ketones, lower glucose, lower trigs, higher insulin sensitivity. I had no explanation for this.
Once you appreciate the Protons concept this is exactly what you would expect. There is continued insulin signalling when there should be physiological insulin resistance. While ever adipocyte size is kept low, via the ketogenic nature of the diet, enhanced insulin sensitivity should persist.
The down side is that glucose metabolism will continue. If your approach to life is to stop using glucose as an energy substrate there is absolutely no need to maintain glycolysis in the face of a ketogenic diet. Simply refusing to listen to insulin is my preferred option. Someone running their metabolism of fats should have minimal need for insulin sensitivity and buying insulin sensitivity at the cost of metabolising linoleic acid, with its daughters 4-HNE and 13-HODE, is not something which appeals to me. But be aware of the study and the joy it will give to the saturophobes...