Dr Kendrick has a different take on that and it makes sense to me.
"Imagine, if you will, a body with full sugar stores* – this would be most people, most of the time. You eat carbohydrate a.k.a. proto-sugar. With sugar stores full, there is nowhere for this excess sugar to go, so the liver converts it all into fat a.k.a. triglycerides. The liver tries to stick this excess triglyceride into a lipoprotein called a VLDL (Very Low Density Lipoprotein). However, this process is complex, so the liver starts to fill up with fat."
I read this as the sugar backs up since it has nowhere to go, causes the production of more insulin and this helps to put the triglycerides into fat cells.
I would be really interested in why I flush insulin as the description says if you are diabetic you produce more than you need hence storing fat becomes inevitable.
I read a couple of sources, way back in the 90s (Montignac, Atkins) who claimed that without insulin resistance, a person does not become over weight.
I've never checked their sources, but it seems a perfectly reasonable theory, to me.
And IF it is correct, then the 2/3 overweight would naturally match the 2/3 with insulin resistance.