This document provides information about diabetes, including the different types. It discusses that diabetes mellitus is a group of metabolic diseases where a person has high blood sugar because their body either does not produce insulin (type 1 diabetes) or does not properly use the insulin it produces (type 2 diabetes). Type 1 diabetes is often diagnosed in children and requires insulin treatment. Type 2 diabetes most commonly occurs in adults and can be caused by obesity. Lifestyle changes like diet and exercise are important for managing both type 1 and type 2 diabetes.