You just learned me! Based on my half-assed reading of the science behind a lot of this diet, yet I assure I have read quite a bit on it, I thought outright that any variant of diabetes would be well met by this diet as it suppresses insulin production to some degree. But, now that you mention it, I recall hearing that the type of diabetic can have very different things going on with respect to blood sugars.
When my daughter gets sick, and as most people when sick she wont eat, we note that her blood sugar level runs at a pretty steady level.
You would think not eating would cause lows but she stays steady.
Generally we try and feed her some liquid with sugar - popsicles.
So the popsicle gives her some glucose and keeps her blood sugar steady.
With insulin and such small doses of glucose she risks a low.
But without insulin her body wont utilize the glucose.
So her body turns to eating her fat, which she has very little of, and muscle which than builds ketones in her blood fast.
We get between a rock and a hard place when she is sick.
She wont eat enough food so that we can provide enough insulin to keep her body fueled. This results in a steady blood sugar level. But failing to provide insulin results in the body requiring fuel from ketones which she will not burn and they build up leading to keto acidosis.
Caretakers just checking blood glucose will typically think things are great until the piss on a stick or take a blood stick and check ketones finding out the person is going 5 or higher fast.
Ive talked about my ketone habits and diabetes with the endocronologist. There is a plaque on a building just outside the Joslin Clinic in Boston noting the location of where I think it was the first administration of insulin in the US occured. A diabetic woman was the patient. She was living into her late thirties with the condition which was amazing at the time. Ive been told she basically ate butter or fasted but was rail thin and sickly. The insulin saved her life and I think she lived into her 60s.
Why guess....
Here are the facts....
http://blog.joslin.org/2017/08/the-first-dose-of-insulin/
A Type 2 diabetic, insulin resistant vs insulin dependant Type 1, probably would see greater benefit from this diet.