If he has seen reversals for Type 2 patients from a dietary regimen, that's great. Some will eventually wind up on insulin if control of the disease slips away. I have heard (though not verified) that a reversal of Type 2 may occur using strict dietary control. For type 1, however, I'm doing as best as can be done - keeping my glucose levels as close to a non-diabetic level as possible. There is no cure as of yet, short of pancreas transplant and a lifetime of anti-rejection drugs, but there has been a lot of encouraging news lately from stem cell researchers.
“You can always count on the Americans to do the right thing, once they’ve exhausted all other options.” - Winston Churchill