can my son die from not taking proper care of himself w/his diabetes? He weighted 240 now he's 165.?

My son, aged 22 was diagnosed 8 months ago w/type 2 diabetes and he is not properly taking care of himself. His sugar level stays past 450-Hi. He is admitted at least 3 times every month into the hospital.

I am afraid for him. With him knowing what he can and cannot have, he still eats what he knows is not good for him. His appearance has changed dramatically. He looks like he is at a late stage of cancer. I explain to him that he does not have to look like that or be that ill. He states he knows this but does nothing to change. He has his blood count kit, that he does not use a continuous basis. I am at my wits w/his behavior, it's like he's giving up. He use to be in the entertainment industry but because he is now sick he had to leave his group. I feel that he is going through a stage of depression but he will not open up to me. I asked his doctor can I have him committed because he does not properly take care of himself, but was told that being he is an adult, that cannot be.