This document defines diabetes and discusses its types and symptoms. It notes that type 1 diabetes is an autoimmune disease where the body destroys insulin-producing cells, while type 2 diabetes involves insulin resistance. Risk factors for type 2 diabetes include genetics, age, and lifestyle factors like inactivity and weight gain. Uncontrolled diabetes can lead to serious complications, but type 2 diabetes can be prevented or delayed through lifestyle changes like increased physical activity and improved diet.