It depends on how you view it. Jenny Ruhl for instance thinks obesity is totally irrelevant when it comes to to type 2 diabetes, and for me that is totally irresponsible and goes against all research about diabetes. She also says there is no cure for diabetes type 2, its all genetics, you did not to cause it, and the ONLY way for you to control it, is to go on a lowcarb diet., but you cannot cure it.
I disagree with all of that really, compared to how I see the current scientific literature on diabetes type 2.
She also bashes Roy Taylor of Newcastle university a lot because he used to think that diabetes is a progressive disease, despite the best treatment given in a large scale uk study. Well now Roy Taylor thinks diabetes is curable
http://www.ncl.ac.uk/magres/research/diabetes/reversal.htm
And Jenny Ruhl thinks its not
http://diabetesupdate.blogspot.no/2011/06/idiotically-dangerous-diet-reverses.html
This for me illustrates how she never really updates her understanding of diabetes, and her webpage is really out of date as well.
Jenny Ruhl is also not a type 2 diabetic in the traditional sense, but got a rare genetic variant of the disease, so what works for her, is not really applicable for the average type 2.
In short diabetes type 2 is curable, but you have to lose weight in order do to it, and this is much more important than cutting carbs, but Jenny Ruhl just tells people that genes did this, they cant cure it, and lowcarb is the answer for everything, I think she is wrong, and people must be robust in opposing her, even if she spreads a message that is quite comfortable to hear.