Hi Jim, Those are some interesting thoughts but there are a couple of weaknesses in her position: 1. We are all individuals. As such, we each have different protein and energy needs. Those needs also vary from day-to-day. I don't think that any fixed formula like that will produce the same results for everyone. 2. If fat only comprises 65% of the diet then 35% is made up of carbohydrates and proteins. Much of that 35% will also be burned as glucose, as excess proteins are converted to glucose, and carbs are mostly reduced to glucose. While the body may be using mostly fats for energy, it will use some glucose as well. It isn't an on or off thing. It is a question of proportions. Typically, the more fats that are consumed as energy, the deeper the level of ketosis, but that also varies from one individual to the next. My wife and I can eat identical meals for several days. She will reach moderate to deep ketosis (40 to 80 mg/dL) while I will only experience mild ketosis (about 15 mg/dL). Each of us has fairly unique energy needs. There are smaller variations in protein needs, but those also vary considerably. A friend who is an avid body builder has much greater protein requirements than I do. 3. I have been not, to my memory, experienced the 6 week plateau she talks about. Happy New Year to you and all list members. best wishes, Ron