I'm with
@Brunneria here.
The sweeping statements from
@Jim Lahey that "almost all" T2s have or have had a fatty liver implies that all T2s are tested for a fatty liver.
To the best of my knowledge very few T2s are tested for a fatty liver.
If I am correct, then the above is speculation and not scientific fact.
I haven't read anywhere so far that definitively says that T2 is defined by insulin resistance caused by a fatty liver (which Jim seems to be implying) and anything else isn't T2. As far as I am aware T2 is used as a global catch all for impaired glucose management where there isn't a more specific diagnosis.
When I was diagnosed over 11 years ago I was told that there were two main causes of T2 - insulin resistance or a failing pancreas.
I was also told that nobody tested for this because regardless of the cause the treatment was the same.
Now I don't really agree with this, because I would have found it much more helpful to know what was going on, but at the time I took the GP's word for it. This was a very diabetes aware GP practice, as well.
I had the opportunity to chat to Prof Roy Taylor at a conference a year or so ago and he said that the longer you had T2 the less chance you had to reverse T2 by dramatic weight loss, but a good target was to have the same weight and waist measurement as when you were late teens/early twenties. If it doesn't cure you it certainly won't do you any harm. Still not quite there.
At the Diabetes UK conference this year there was much excitement about recent research which suggested that T1 Beta cells might be able to regenerate. However it seems that nobody had really joined the dots up and wondered why the T2 beta cells were not regenerating. I was asked if I wanted to donate my pancreas to them for research, but declined as I was still using it.
So there are still more unknowns than knowns about diabetes and blanket statements can at times be misleading.
Edit: forgot to say that the statistic used to be that 80% of T2s on diagnosis were overweight or obese. That is a reasonable starting point to assume that many or most of them are likely to have a fatty liver. However there is that minority of 20% to consider. Also, correlation/causation and stuff.