Certain disorders such as diabetes mellitus, diabetes insipidus,and Addison's disease can increase the excretion of urine and
thereby lead to dehydration.
Because people with Type 2 Diabetes
produce some Insulin, ketoacidosis does not usually develop. However, the blood sugar levels can become extremely high (often exceeding 1,000 mg/dL). Such high levels often happen as the result of some superimposed stress, such as an infection or drug use.