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Type II diabetes is classified as non-insulin dependent diabetes because, in this form of diabetes, the body still produces insulin but either does not use it effectively (insulin resistance) or does not produce enough to maintain normal glucose levels. This distinguishes it from Type I diabetes, where there is an absolute deficiency of insulin due to the autoimmune destruction of insulin-producing beta cells in the pancreas, leading to a necessity for external insulin administration.

The term "non-insulin dependent" reflects the fact that many individuals with Type II diabetes can often manage their condition through lifestyle interventions, such as diet and exercise, as well as oral medications, before needing insulin therapy. The classification helps highlight the differences in treatment approaches between Type I and Type II diabetes, and it signifies the capacity of Type II diabetes to be managed without mandatory insulin use in the early stages.

It's worth noting that Type III diabetes is a less commonly used term and sometimes refers to the idea of insulin resistance associated with Alzheimer’s disease, which is not an official classification of diabetes. Thus, identifying Type II diabetes accurately as non-insulin dependent allows for better understanding and treatment strategies for those diagnosed with this condition.