sentence2_structure: Diabetes<>is<>unpreventable$$$it<>is<>of the second type
sentence1: Studies have shown that good glucose control may prevent or delay complications of type 2 diabetes such as heart disease, kidney disease, or blindness.
sentence2: Diabetes is unpreventable in the type one form but may be prevented by diet if it is of the second type.
question: What disease is unpreventable in the type one form but may be prevented by diet if it is of the second type?