This document discusses diabetes, including the main types of diabetes, symptoms, causes, how glucose is transported and used in the body, the role of insulin, importance of glucose, and treatment and prevention of diabetes. Type 1 diabetes is characterized by the body not producing insulin and usually develops in childhood. Type 2 diabetes involves the body not producing enough insulin or cells resisting insulin's effects, and is often associated with obesity and older age. Symptoms include frequent urination, excessive thirst, hunger, weight loss and fatigue. Treatment focuses on managing blood sugar levels through insulin, diet, exercise and weight control depending on the type of diabetes.