NR 282 Review of knowledge for Module 2 Diabetes Answers 1. Diabetes mellitus (DM) is caused by a lack of insulin production by the beta cells of the pancreas. 2. Diabetes mellitus is usually described as being three types: Type 1 Diabetes or insulin dependent, type 2 diabetes or non-insulin dependent and also gestational diabetes. 3. Type 1 DM develops when the beta cells of the pancreas ceases to produce insulin. This can be caused by pancreatic disease, infections in the pancreas and also gen...