sentence2_structure: Diabetes<>is<>unpreventable$$$it<>is<>of the second type
sentence1: The study suggested that leptin may be useful in the control of Type II diabetes, the form of the disease that often develops in older, overweight people.
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?