Which statement best differentiates type 1 from type 2 diabetes at disease onset?

• A. Type 1 Is Primarily Insulin Resistance; Type 2 Is Autoimmune Destruction
• B. Type 1 Occurs Only in Children; Type 2 Only in Adults
• C. Type 1 Is Autoimmune With Early Insulin Deficiency; Type 2 Is Insulin Resistance With Gradual Beta-Cell Failure
• D. Type 1 Does Not Involve Autoantibodies; Type 2 Involves Autoantibodies

Answer: (C)

The main idea is how the insulin problem starts in each type. Type 1 diabetes begins with an autoimmune attack on pancreatic beta cells, causing an abrupt drop in insulin production—an absolute deficiency. This autoimmune process is often signaled by autoantibodies against islet cells or related antigens. Because there’s little to no insulin left, hyperglycemia can appear quickly and may lead to diabetic ketoacidosis if not treated.

In contrast, Type 2 diabetes starts with insulin resistance in the body's tissues. The pancreas initially responds by producing more insulin, but over time the beta cells fail and insulin output declines. The onset is usually more gradual, and autoantibodies are not a feature of the disease.

So the best statement reflects that Type 1 is autoimmune with early insulin deficiency, while Type 2 is driven by insulin resistance with gradual beta-cell failure.