I need advice

I already posted this under Introduce Yourself but I don't know if people really read that so here it is again.

Hello everyone,
My name is Casey. I am not diabetic but my father is. He is 64 years old, he has had adult onset diabetes for about 15 years simply from a terrible terrible diet.
By terrible I mean ice cream everyday, nothing but complete junk food like zingers, doritos, fastfood etc. He will not touch a vegetable, except potatoes. He also doesn't get any exercise at all. Shockingly he is thin. He always has been. I don't know how.
He takes insulin injections everyday and he thinks that as long as he does that he can eat whatever he wants. He actually thinks that he is healthy as long as he is thin.
What I really really need is a way to show him the reality of how this disease will affect him as he gets older if he doesn't make a change. I would really like to show him the most morbid examples that I can find. I think that might get his attention.
Do you know any documentaries or websites that might bring him into reality. I don't think I could get him to read a book about it. He would blow it off.
I want my dad to be around for a long time and I want him to be healthy for a long time. I don't know what I would do without him.
Do you have any advice for me?
Thank you so much,
Casey