Diabetes mellitus is a chronic metabolic disorder in which the body fails to produce enough insulin or is unable to use the insulin it produces effectively. Insulin is a hormone that is produced by the pancreas and helps the body regulate the amount of glucose (sugar) in the blood. When the body is unable to produce enough insulin or use it effectively, the result is high blood sugar levels, which can lead to a variety of complications, including heart disease, stroke, and kidney failure. The most common form of diabetes is type 1 diabetes, which is an autoimmune disorder in which the body’s own immune system attacks the cells in the pancreas that produce insulin. Type 2 diabetes is far more common and is caused by a combination of lifestyle factors, including obesity, lack of physical activity, and eating a diet high in processed foods and refined sugars. The primary symptom of diabetes mellitus is elevated blood glucose levels, which can lead to a variety of complications, including increased thirst and urination, fatigue, and weight loss. Other symptoms include blurred vision, frequent infections, and slow-healing wounds.