My brother had undiagnosed Type 2 diabetes - a sore on his foot got him to the doc - he was hospitalized for 4 days and came home after learning to self administer 3 insulin shots a day.
He's never read the Dr.'s book but was scared enuf to do exactly as I advised (for the last 3 years, that is!) and cut the carbs to being whole & healthy.
He's progressed to not even having to take ORAL insulin pills!

(Altho' he keeps some on hand just in case) - he went from all those shots to feeling great mainly thru the Atkins Diet - and a bit of intentional exercise/walking!