I'm looking forward to hearing your podcast.
Keep in mind that there are two types of diabetes.
Type 1 diabetes is usually Juvenile onset, and insulin dependent. It is not related to obesity. I presume your photo is of a person with type 1 diabetes.
Type 2 diabetes is usually related to older individuals, and is related to obesity. While it may require insulin supplement, it is often treated with diet. The pancreas continues to make insulin, but the cells develop a resistance to the insulin.
Type 2 diabetes is especially prevalent in the Pima Indians, and has been significantly improved with diet and exercise programs.