Types 2's do not morph into Type 1's when they go on insulin. They are actually 2 diferent diseases. I really think the medical community doesn't always understand the difference. Type 1 is usually an autoimmune attack of the pancreas. Most Type 1's will test positive on the GAD antibody test and very low on the C-Peptide test. A lot of people are misdiagnosed as Type 2's because they are in their 20's, 30's , 40's or even older. They are never even offered the extra tests. There is also something called Type 1.5 which is slow onset Type 1. These people appear as Type 2's but test positive on the GAD Antibody test.