The good news is that as you loose weight, you actually start getting full on less. I can recall the day when I'd "Super Size" a mickeyd's meal. These days, if I go at all (why tempt fate?) I can barely do a Happy Meal!
Diabetes is treatable but the damage it causes is not. My mom is blind because she chose not to properly manage her diabetes. It's good motovation for a diet when you see the results. Better to not have to deal with it to begin with. There are some amazing statistics out there if you have a look. While not in ALL cases obviously, it's a disease that can be prevented. Knowledge is power.