What is the difference between type 1 and 2 diabetes?

What is the difference between type 1 and 2 diabetes?

• A. Type 1: childhood onset, insulin insufficiency; Type 2: adult onset, insulin insensitivity
• B. Type 1: adult onset, insulin resistance; Type 2: childhood onset, insulin deficiency
• C. Type 1: autoimmune destruction of beta cells; Type 2: autoimmune destruction of alpha cells
• D. There is no difference between Type 1 and Type 2 diabetes

Answer: (A)

The key difference lies in what goes wrong with insulin: Type 1 is an autoimmune loss of insulin production, while Type 2 is insulin resistance with a later, often partial loss of production.

In Type 1, the immune system destroys pancreatic beta cells, so little or no insulin is made. This usually emerges in childhood or adolescence, and because there’s no usable insulin, people need lifelong insulin therapy to control blood glucose.

In Type 2, the body’s tissues don’t respond well to insulin (insulin resistance), and over time the beta cells may fail to keep up, leading to high blood glucose. It typically appears in adults with factors like obesity and metabolic syndrome, and initial treatment focuses on lifestyle changes and medications that improve insulin sensitivity or reduce glucose production, with insulin therapy added if needed.

That’s why the described contrast—childhood onset with insulin insufficiency for Type 1, versus adult onset with insulin insensitivity for Type 2—best captures the fundamental distinction between the two. The other options mix up which cells are affected or deny any difference between the types.