Hi again Jim,
The remnants of a prior thread in your post about psoriasis had me 
re-reading and re-thinking this prior discussion. You said:
``Interesting. So if even a tiny amount of excess protein is consumed, 
glucose is produced (rather inefficiently) via gluconeogenesis which the 
body will burn preferentially, therefore reducing ketogenesis``

I`m not sure that the body preferentially burns either glucose or fats. 
I think there are variations, from one type of cell to another, such as 
cells that form heart muscle preferentially burn fats, but I think that 
most cells will go either way. It is just that where blood glucose 
rises, more insulin is secreted, and that insulin inhibits fat 
mobilization and transport into cells for energy. I think that most of 
the variation in fuel usage is driven by variations in hormonal and 
enzyme production.

That is one reason that, after an initial period of adaptation, we can 
quickly shift back into ketosis and out of ketosis.  The shift becomes 
slower and more difficult for those with insulin resistance.
best wishes,
Ron