Regarding loosing weight and the need for additional insulin.
Yes. If you can loose weight often the insulin requirements will drop.. HOWEVER
Type 2s often make what SHOULD be more than enough insulin naturally.. And then some of us inject more. The problem is that insulin has a very close relative, more a brother hormone than a kissing cousin (it's that close) HUMAN GROWTH HORMONE.. yes, Insulin is in the same class as HGH. It promotes Growth.. (Weight gain).
Many times I have heard that "overweight puts you at risk for Type 2" But the question is it a risk factor, or a symptom? There are many who think it is a symptom.
Your insulin is not functioning as planned so your body produces more, so you gain weight, which increases insulin resistance, which means you produce still more, which means you gain more....
I'm not the originator of that theory... But the man who preseneted it to me (Do not know if it's his theory or not and no longer able to ask him) Was a Type 1.. Skinny as a pencil. You see, his body produced NO insulin.