sentence2_structure: Diabetes<>is<>unpreventable$$$it<>is<>of the second type
sentence1: Gestational diabetes most commonly resembles a mild form of Type II diabetes and may require only diet modification.
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?