Insulin deficiency and excess glucagon lead to abnormal carbohydrate, fat, and protein metabolism resulting in diabetic ketoacidosis (DKA). Specifically: 1) Impaired glucose utilization and increased gluconeogenesis and glycogenolysis cause hyperglycemia. 2) Increased lipolysis and synthesis of ketone bodies in the liver from free fatty acids causes ketoacidosis and metabolic acidosis. 3) Glucose levels are usually lower in DKA compared to hyperosmolar hyperglycemic state (HHS) due to greater urinary glucose excretion in DKA patients, who are usually younger with better kidney function. Insulin levels are sufficient to prevent ketogenesis in H