I agree with Daibell.
I'm Insulin deficient at the moment. I am autoimmune and have GAD antibodies which have attacked and killed off a number of my beta cells meaning I can produce some insulin but not enough to manage a 'normal' or non-diabetic lifestyle.
At the moment I have enough cells to manage with a low GI diet and metformin because any insulin produced is given a helping hand by the metformin and low GI foods break down slowly giving my poor remaining cells more time to break down and use the glucose I eat.
Eventually, though no one knows when, the antibodies will kill too many cells for me to be able to rely on this alone and I will then have to inject insulin to break down and use the glucose instead.
Insulin deficiency is awful as you never know when the ticking time bomb of insulin dependency is going to hit you, it's almost like you are living in limbo land and the HCPs are reluctant to actually categorise you as anything due to the lack of insulin dependence (type 1) and the lack of excess weight/insulin resistance (type 2).
The only reprieve is not having to inject or carb count for a little while.... Though the impending doom of it kind of takes the shine off that!
Diagnosed with GD in 2010, Completely disappeared postpartum. Re-diagnosed December 2012 with type 1.5 diabetes, age 26, BMI 22 currently controlled by only Metformin, 500mg twice a day.