I think the duration of the ND effect is crucial.
My opinion on this is formed by 2 things:
Firstly, if you take anybody with impaired glucose tolerance off the Eatwell, and feed them 800 cals a day of food or shakes, then their HBA1c is likely to plummet. That is great news, of course. But testing an HbA1c after 8 or 12 weeks of NDing and declaring 'reversal' is a bit like sending people on an intensive immersive language course and then testing them on the curriculum. They should pass the exam. You would hope.
But if you take those graduating NDers and move them onto the Eatwell for 2-3 months, then you get a better picture of whether they are reversed. 6 months would be better. By then, they will be exposed to enough carb to show up on the HbA1c if it is going to. Also necessary to allow for weight regain. Or not.
My second point is based on my own experience of my own body. It has taken a lot of self testing, and a lot of experimentation (n=1), but i am pretty sure of the following
- i've never had a fatty liver (no blood tests have ever shown the slightest hint)
- i've lost well over 20% of bodyweight to no improvement in bgs (not using the ND)
- i only get T2 level blood glucose when i am eating gluten
- when i am gluten free for several weeks my tolerance for carbs increases to being able to tolerate 'moderate carbs'
So, just think about that for a moment.
It makes me very unsuitable for the ND, yet the ND would appear to work very well for me.
If i went from T2 blood glucose levels on the Eatwell (with gluten) to 12 weeks on the ND, i would lose weight.
Of course. Maybe 15% or more.
My bgs would plummet to non D levels.
The ND is gluten free so my readings would be good!
My HbA1c would be wonderful!
I would be dancing in the streets, claiming reversal and preaching the ND Message.
Then i would revert to the Eatwell or even low Carb (it takes specific effort to Low Carb without gluten, so i would inevitably be eating gluten again)
Within a day or two my bgs would be rising and my 'reversal would be guttering out like a candle in the rain.
Too early to blame weight regain, or fatty liver/pancreas, but i would be getting diabetic bg results in less than a week.
Interestingly, my experience would be completely different if i did the Blood Sugar Diet on 800 cals of real food. Even a hint of gluten in that menu and my bgs would stay wangy. I would still lose weight. But the BSD would leave me unreversed, while the gluten free ND would reverse me temporarily.
And i can't be the only one, can I?
I'm simply not that special a little snowflake.
There must be other people whose food intolerances/medications cause similar effects.
So i am pretty certain that claims of reversal are not worth the pixels they are written in, until there has been several months of normal eating, and an HbA1c or two after that period of normal Eatwell eating.