Are there diseases similar to diabetes?

Yes and no: Diabetes is serious, incurable, a major disturbance in metabolism, predisposes people to atherosclerosis, predisposes to small vessel disease, causes the kidneys to fail, compromises neutrophil function, is autoimmune (type i) or polygenic (type ii), is lifestyle-modifiable, and is common. It shares each with dozens of other diseses. Classroom compare-and-contrast work is for little kids.