Type 1 diabetes is usually diagnosed in children and young adults. It occurs when the body does not produce insulin, which is needed to convert blood sugar into energy. Without enough insulin, blood sugar cannot be used by the body. Symptoms include frequent urination, increased thirst and hunger, weight loss, and blurry vision. Treatment involves checking blood sugar levels, administering insulin as needed, changing injection sites regularly, and working closely with a healthcare team. Diet and exercise are also important parts of managing type 1 diabetes.