"The goal of type 2 diabetes treatment is early blood sugar control to prevent complications and halt progression," said Mazhari. "Control trumps everything because you only have a limited window of opportunity. Once you have complications, the damage may not be reversible. That means using whatever medications it takes, including insulin."

http://www.everydayhealth.com/type-2-diabetes/starting-insulin-for-type-2-diabetes-when-why-and-how.aspx