There are a couple of main types of diabetes, Snowflake.

Type 1 ususally develops in younger people and Type 2 in the older age group ( I think over 40.) You don't have to be overweight to get it, but it is a major contributory factor.

I think over 90% of people with diabetes fall into Type 2 category.

There are also a few other kinds that are linked with pregnancy and other illnesses.