sentence2_structure: Diabetes<>is<>unpreventable$$$it<>is<>of the second type
sentence1: A new vaccine may be just around the corner for the prevention of type 1, or insulin-dependent, diabetes in patients at risk of developing the disease.
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?